A fossil of an extinct dinosaur is found, and the anatomy of the fossil shows similarities to that of a bird.
What possibly explains these similarities?
A. This is purely chance and isn't significant.
B. The extinct dinosaur and modern bird share a common ancestor.
C. All dinosaurs evolved into birds and that's why there aren't any dinosaurs alive today.
D. Dinosaurs choose to fly, and evolved into birds to escape predation and capture food.
Answer:
B sounds like a sensible choice
Explanation:
The extinct dinosaur and modern bird share a common ancestor. So the correct option is B.
What are evolutionary relationships?
Systematics, taxonomy, phylogenetics, and evolution are the four approaches used to investigate evolutionary connections. The branch of science known as systematics is concerned with classifying species and figuring out their relationships. It has two primary branches that may be separated:
Organisms are classified, given names, and grouped in taxonomy. A population, species, genus, or higher-level grouping like a family, order, class, phylum, kingdom, or domain can all be considered as a group or taxon. The word taxon is pluralized as taxa. The determination of evolutionary links or patterns of descent of species is via the study of phylogenetics.
The species of living things that exist now are all descendants of earlier ones. This is the result of evolution or merely time-related change. Branching evolutionary trees can be used to illustrate the evolutionary links between ancestors and their offspring. An evolutionary tree shows which ancestors gave rise to which descendants, much like your family tree does.
Therefore the correct option is B.
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What is the name of the process that results in a karyotype like the one pictured?
O A. Nondisjunction
O B. Crossing over
O C. Gene mutation
O D. Mitosis
HELP SAMA PLZZ
Answer:
THIS IS CROSSING OVER- DNDNNFNCBXJXBDJBXJX WHY DO YOU HAVE SUCH HARD QUESTIONS-
The Offspring produced by a cross between two given types of plants can be any of the three genotypes denoted by A, B, and C. A theoretical model of any of the three genotypes denoted by A, B, and C should be in the ratio 1:2:1. For experimental verification, 100 plants are bred by crossing the two given types. Their genetic classifications are recorded. Do these data contradict the genetic model
Complete question:
The offspring produced between two given types of plants can be any of the three genotypes, denoted by A, B and C. A theoretical model of gene inheritance suggests that the offspring of types A, B and C should be in a 1:2:1 ratio (meaning 25% A, 50% B, and 25% C). For experimental verification, 100 plants are bred by crossing the two given types. Their genetic classifications are recorded in the table below.
Genotype Observed frequency
A → 18 individuals
B → 55 individuals
C → 27 individuals
Do these contradict the genetic model?
Use a 0.05 level of significance.
Determine the chi-square test statistic.
Answer:
Do these contradict the genetic model? No, according to the chi-square test, there is not enough evidence to reject the null hypothesis of the population being in equilibrium.
Explanation:
Available data:
Crossed genotypes: twoGenotypes among the offspring; Three → A, B, and CExpected phenotypic ratio → 1:2:1Total number of individuals, N = 100A = 18 individualsB = 55 individualsC = 27 individualsSo, let us first state the hypothesis:
H₀= the population is equilibrium for this locus → F(A) = 25%, F(B) = 50%, F(C) = 25% H₁ = the population is not in equilibriumNow, let us calculate the number of expected individuals, according to their expected ratio.
4 -------------- 100% -------------100 individuals
1 --------------- 25% -------------X = 25 individuals A
2 -------------- 50% -------------X = 50 individuals B
1----------------- 25%--------------X = 25 individuals C
A B C
Observed 18 55 27 Expected 25 50 25 (Obs-Exp)²/Exp 1.96 0.5 0.16(Obs-Exp)²/Exp
A) (18 - 25)²/25 = 49/25 = 1.96
B) (55 - 50)² / 50 = 25/50 = 0.5
C) (27 - 25)²/25 = 4/25 = 0.16
Chi square = X² = Σ(Obs-Exp)²/Exp
∑ is the sum of the terms O are the Observed individuals: 2 in chamber B, and 18 in chamber A. E are the Expected individuals: 10 in each chamberX² = ∑ ((O-E)²/E) = 1.96 + 0.5 + 0.16 = 2.62
Freedom degrees = 2
Significance level, 5% = 0.05
Table value/Critical value = 5.99
X² < Critical value
2.62 < 5.99
These results suggest that there is not enough evidence to reject the null hypothesis. We can assume that the locus under study in this population is in equilibrium H-W.
So What are all the good things about parakeets that i can convince my dad to let me keep my 10 parakeets my mom got me
Answer:
They are cute, they can learn easily, you can train em, they're honestly good company, and uh- that's all I could think of :/
Explanation:
Have a nice day :) And I hope you get to keep your uh "birdies"
The first stage in the life cycle is called:
-prenatal.
-early childhood.
-middle childhood.
-infancy.
Answer:
Infancy
Explanation:
From birth to age three, early childhood includes infancy and the toddler years. The remaining years of childhood are from the ages of four to eight, and this is when children start kindergarten. During this period of life, a variety of significant physiological and emotional changes occur.
is this correct please dont randomly answer. but answer if u know
Answer:
dark colored forest with dark bark
Explanation:
since the population has gone down it shows the moths cannot blend in with their environment
When the offspring's phenotype is a "combination" (mixture) of parents' phenotypes
A) Punnett square
B) Polygenic inheritance
C) Codominance
D) Incomplete dominance
Answer: C) Codominance
Explanation:
When the offsprings phenotype is a combination of both parents
Answer:
I think the answer is incomplete dominance!! my teacher just explained it
Explanation:
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Paar
ALGALEHEEN BILINGUAL SCHOOL
Grade 1 Science Homework #3.7
Topic 5.Lesson 4 Where plants and
animals live.
1.
A. True or false .
x
The environment is everything around a living thing
.
.
Answer:
Explanation:
A habitat is a special place where a plant or animal lives
Answer:
True
Explanation:
PLEASE HELP!! Only one of the following statements is true: Identify the true statement and explain why it is true.
a. Two organisms can be of different phylums but the same kingdom.
b. Two organisms can be of different kingdoms but the same phylum.
Which of the following pieces of evidence does not explain how mid-ocean ridges are formed?
A. The rocks closer to the ridge are younger than those farther away.
B. Mid-ocean ridges are found on the bottom of most oceans.
C. The magnetic orientation of rocks is symmetrical on either side of mid-ocean ridges.
D. Pictures of ridges show evidence of lava flows.
Answer:
B
Explanation:
i am sorry if this is wrong
The following pieces of evidence does not mid-ocean ridges are formed Mid-ocean ridges are found on the bottom of most oceans.
What is mid-ocean ridges?The central parts of the oceans have mid-ocean ridges. The mid-ocean ridges are volcanic underwater mountain ranges.
There is constant propelling of magma, and as the magma cools off quickly it creates new crust.
This results in the mid-ocean ridges gaining heights of up to 1.5 km above the surrounding area.
So, option B is correct.
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What is an example of an event that can compromise an ecosystem?
1.seasonal climate change
2.seasonal dry period
3.d eveloping land around cities
4.high temperatures
Answer:
seasonal climate change
Explanation:
based on the climate can vary whether or not the animal can adpat to live in that ecosystem. take polar bears for example. scientists say that polar bears won't be able to adapt to climate change bc it's changing so quickly.
hope this helps! have a fantastic day/night
An example of an event that can compromise an ecosystem is seasonal climate change.
What is an ecosystem?An ecosystem is a place where all animals and plants, biotic and abiotic factors live together interdependent to each other.
There are different types of ecosystem:
Terrestrial ecosystemOcean ecosystemDesert ecosystemThus, the correct option is 1. Seasonal climate change.
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Which of the following best describes what causes plasma cells to form during a humoral immune response?
a. Memory B cells signal phagocytes to attack infected cells and divide, producing plasma cells.
b. Memory T cells recognize antigens and signal T lymphocytes to divide, producing plasma cells.
c. The antibodies on the surface of B cells bind to antigens, and the B cells grow and divide, producing plasma cells
d. The antigens on the surface of a pathogen attack healthy cells, and the resulting inflammation signals helper T cells to divide, producing plasma cells.
Answer:
Explanation:
Answer:
C. The antibodies on the surface of B cells bind to antigens, and the B cells grow and divide, producing plasma cells.
Explanation:
I took the test
How many mL of stock solution of 2M NaCl do you need to prepare 100 mL of 0.150M NaCl?
Answer:
7.5mL
Explanation:
Comsidering the definition of dilution, 7.5 mL of the stock solution of 2 M are required to prepare 100 mL of 0.150 M solution.
Dilution is a procedure by which the concentration of a solution is lowered. It is achieved by adding more solvent to the same amount of solute.
Then the amount of solute does not vary, but the volume of the solvent does: when more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volume
In this case, you know:
Ci= 2 M Vi= ? Cf= 0.150 M Vf= 100 mLReplacing in the definition of dilution:
2 M×Vi= 0.150 M×100 mL
Solving:
[tex]Vi=\frac{0.150 M x 100 mL}{2 M}[/tex]
Vi= 7.5 mL
In summary, 7.5 mL of the stock solution of 2 M are required to prepare 100 mL of 0.150 M solution.
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brainly.com/question/20113402?referrer=searchResults brainly.com/question/22762236?referrer=searchResultsWhich statement provides the best explanation of the difference in biomass of organisms found at each trophic level?
Answer: organisms at higher tropic levels have less energy available to them in organisms at lower trophic levels
Explanation:
6. Parts per million is used to express the A) atomic mass of an element B) concentration of a solution C) volume of a substance D) rate of heat transfer A B
help guys pls !!!!!!?
Answer:
False
Explanation:
Please Brainliest
Now that you have mapped some of the morphological characters on the evolutionary relationships, you should notice conflicts with regard to these characters defining some clades. What other types of evidence do you think scientists used to support this particular phylogeny, assuming the above phylogeny is correct
Answer:
is a phylogenetic tree for all nine animal phyla that you studied ... Now that you have mapped some of the morphological characters on the ... you should notice conflicts with regard to these characters defining some clades. What other types of evidence do you think scientists used to support this particular ...Explanation: Similar to detective work, scientists must use evidence to uncover the facts. In the case of phylogeny, evolutionary investigations focus on two types of evidence: morphologic (form and function) and genetic. Hope It Helps Here For Your Help
PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.
Answer:
the answer is a
Explanation:
its a physical reaction due to the change in apperance
Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.How can DNA be used to help solve a crime?
Answer:
Rosalind Franklin had taken the first picture showing the structure of DNA, called the double helix. This helped confirm what Watson and Crick had thought, thus leading them to make the first accurate model. DNA can be used to solve a crime because it can prove a certain person did something. EX: finding hair and who it belongs to/ finding finger prints and who they belong to.
hope this helps!
Indicate true or false for each statement by writing the words true or false in the blanks. Certain plants contain compounds similar to ecdysone which serve as a defense against insects. Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests
Answer:
Certain plants contain compounds similar to ecdysone which serve as a defense against insects. False
Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. True.
Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests. True
Explanation:
The plants produce toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones as a defense against insects. Juvenile hormone levels are high in insect larvae but its concentration decrease when the insect transform into adult stage and in order to occur metamorphosis. Ecdysone and juvenile hormone are widely used as insecticide because it prevents the insects to transform from larva to adult so if they can't mature they can't harm the plants or other things of our environment.
What is an example of biotechnology? What example from the Gene Editing article explains how biotechnology can be used for carbohydrates, lipids, and proteins?
Answer:
Synthetic insulin and synthetic growth hormone and diagnostic tests to detect various diseases are just some examples of biotechnology
Example of Gene Editing is Dalmatians, which often carry a genetic mutation that makes them prone to suffer from bladder stones.
?
Explanation:
HAVE A GOOD DAY
Need help!!! asap due in a hour
what are 2 characteristics of s waves
Explanation:
s waves are shear waves. they move by material flexing or deformity sideways from the direction of waves travel
Evolution is a result of–
a. natural selection.
b. species not adapting quick
enough.
c. competition for resources.
d. harmful mutations.
Answer:
c
Explanation:
PLEASE ANSWER ILL GIVE YOU BRAINLIEST
Answer:
3rd bubble
Explanation:
convergent boundary
Explanation: When two plate move towards each other they converge or come together. The collision between two plates that are moving towards each other is called a convergent boundary. When an ocean plate meets a continental plate at close to a straight line ( 180 degrees) the result is a subduction zone.
2. Which of the following is not used to study plate tectonics:
A) paleomagnetism
B) earthquake waves
C) sand dunes
D) fossils
Answer:
c) sand dunes
What term means removing the nucleus from a cell?
A.enucleation
B.disnucleation
C. nuclear fission
D. nuclear proliferation
Why do scientists believe that some tectonic plates are moving away from each other?
What statement most directly demonstrates a way that the geosphere is involved in the nitrogen cycle? A. Fossil fuels form when decaying organisms are buried underground for long periods. B. Animals break down proteins and other nitrogen-containing compounds into waste products. C. Some plants absorb nitrogen from the air and use it to form proteins. D. Bacteria that convert ammonia into nitrites and nitrates are found in the soil.
Answer:bacteria that convert ammonia into nitrites and nitrates are found in the soil.
It on Plato
Answer:
bacteria that convert ammonia into nitrites and nitrates are found in the soil.
Explanation:
what is the outcome of cell signaling
Answer:
Other important large-scale outcomes of cell signaling include cell migration, changes in cell identity, and induction of apoptosis (programmed cell death).
Explanation:
