Answer:
3) 5 million years
Explanation:
The rock is 5 million years old because the rock contains only 50% of the radioactive isotope. We know that this rock decays to become half in 5 million years. Initially, the rock has 100% of radioactive isotope and 0% of the new element that forms with the decaying of the rock. But 50% of the radioactive isotope decays and 50% of the new element is formed so we can say that it reaches to its half age which is 5 million years.
In an energy pyramid, which level has the most available energy?
A.Producer level
B.First level consumer
C.Second level consumer
D.Third level consumer
Answer:
The correct answer is -A. producer level.
Explanation:
the first trophic level is the level of photosynthetic organisms they produce their food and energy on their own from the ultimate source of energy, the Sun. This is why they are called producers.
Producers have the most energy in any ecological ecosystem as all other organisms get food from these directly or indirectly. Only 10 percent of total energy is transferred from one trophic level from producers to the next tropic level through consumers of different trophic levels.
What is the benefit of having a variety of pollinating birds and insects, and how could this service be harmed by changes in their population?
Answer:
b
Explanation:
The benefit of pollinating birds and insects is that they help to fertilize plants iby transferring pollen from one flower to another between plants when feeding on nectar
What is pollination?Pollination is the process by which pollen grains is transferred from the male anther of a flower to the female stigma. Pollination occur so that there will be production of offspring for the next generation. One of the ways that plants reproduce their offsprings is by making seeds.
Therefore, The benefit of pollinating birds and insects is that they help to fertilize plants iby transferring pollen from one flower to another between plants when feeding on nectar
Learn more about pollination below.
https://brainly.com/question/3431390
what type of limiting factor is space
A.) abiotic
B.) biotic
For Phase 1, the therapeutic modalities used generally will be ones that decrease blood flow.
O a. True
O b. False
Answer:
A.TRUE
yan po yung answer
approximately how much dna is found inside the nucleus of a typical human cell if it were unwound and stretched end to end
Answer:
2 meters (3 Gb of base pairs)
Explanation:
The human genome is composed of 3 billion (3 Gb) base pairs, which are organized in 23 pairs of chromosomes. Within the nucleus, DNA is compacted by histone proteins to form nucleosomes and these structures are then organized in chromatin fibers that undergone higher-order compaction. The compaction of chromatin fibers is accomplished by proteins and Matrix attachment DNA regions (MARs) that bind specifically to the nuclear matrix. In an unwound state, each cell nucleus in the human body has approximately 2 meters of DNA (if the DNA molecule would be stretched end-to-end).
Which describes the struktures shown below the soil line?
A. glucose is made here
B. absorbs water and minerals
C. contains vascular tissue
D. B and C are correct
Answer:
its D
Explanation:
Its D cause plants use their roots to get water and the vascualar tissues are found in the root most of the time.
HELPS ASAP!! How do the retinas of the eyes of night hunting amimals differ from the retinas of animals that hunt during the daytime.
They have more rod cells
They have fewer cone cells
They have more cone cells
They have fewer rod cells
The answer is they have more rod cells
The offspring of the round-seed allele and the wrinkled-seed allele will have the ___________ phenotype
Answer:
4738hrjeifgt47ruj3
Explanation:
How can alleles show incomplete dominance?
Answer:
When an allele isn't completely expressed over its paired allele for a specific trait, the result is an intermediate of the two allele, a third phenotype.
This is termed as incomplete dominance.
A parents traits are inherited by offspring in the form of dna carried on
Answer:
Is this a true or false question? If so, this statement is true.
Explanation:
A plasmid that encodes resistance to ampicillin and tetracycline is digested with the restriction enzyme PstI, which cuts the plasmid at a single site in the ampicillin-resistance gene. The DNA is then annealed with a PstI digest of human DNA, ligated, and used to transform E. coli cells. What antibiotic-resistance phenotype(s) (characteristics) will be found on the plate
Answer: Tetracycline.
Explanation:
A plasmid is a small circular DNA molecule found in bacteria that is separate from the bacterial chromosome and replicates independently of it. They encode for certain genes that play a key role in antibiotic resistance. Restriction enzymes are endonucleases that catalyze the cleavage of phosphodiester bonds in different regions located within a DNA strand. PstI is an example of an endonuclease, it is a type II restriction enzyme produced by the microorganism Providencia stuartii that possesses a restriction target in double-stranded DNA dependent on an unmethylated, palindromic, asymmetric sequence, and in this example, it cuts the plasmid at a single site in the ampicillin-resistance gene. After that, the DNA is annealed with another fragment of DNA and this new recombinant molecule is used to transform E. coli cells. Transformation is a key step in DNA cloning because it occurs after restriction enzyme digestion and ligation treatments and transfers newly made plasmids into bacteria. So these bacterias will have a new fragment of DNA, which still has a tetracycline resistance gene but it no longer has the ampicillin resistance gene because it was disrupted by the restiction enzyme. Thereby, the antibiotic resistance phenotype is the tetracycline resistace.
The myenteric plexus is located in which layer of the alimentary canal?
A. Mucous
B. Serosa
C. Sumucosa
Answer:
A) mucous
Explanation:
The myenteric plexus is located in which layer of the alimentary canal?
A. Mucous
B. Serosa
C. Sumucosa
Wall of the alimentary canal contains four tissue layers which are
✓ the mucosa
✓ submucosa
✓muscularis
✓serosa.
The mucosa can be regarded as innermost tunic of the wall, which
serves as lines in the lumen of the digestive tract. It contains epithelium, which is an underlying loose connective tissue layer, and it reffered to as " lamina propria" along with thin layer of smooth muscle that is reffered to as" muscularis mucosa" .The myenteric plexus is found in between longitudinal layers as well as circular layer of the muscularis externa. It serves as the one that regulate neuronal intestinal motor function.
what's assembled during the second step of protein synthesis
Answer: Translation is the second step in protein synthesis. It is shown in Figure below. Translation takes place at a ribosome in the cytoplasm. During translation, the genetic code in mRNA is read to make a protein. In the first step, called transcription, the genetic code in DNA is copied by RNA. In the second step, called translation, the genetic code in RNA is read to make a protein. A mutation is a change in the base sequence of DNA or RNA.
Explanation:
Plsssss help
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Antibiotics treat bacterial infections. If a doctor is prescribing antibiotics to a patient, which disease does the patient most likely have?
Answer:
bacterial diseases
Explanation:
Floods, droughts, fires, and earthquakes are examples of
Answer:
the answer is natural disasters
Answer:
Natural disasters
Explanation:
hope this helps
When is sunlight most intense on Earth
Select one:
When the light is at a steep angle to the ground.
When the light is parallel to the ground.
When the light is perpendicular to the ground,
When the light is at a shallow angle to the ground.
Answer:
When the light is parallel to the ground.
When the light is perpendicular to the ground,
When the light is at a shallow angle to the ground.
Explanation:
The first organisms arose from non-living molecules found on early earth. Which theory best describes how
this organism arose?
natural selection
abiogenesis
biogenesis
variation
Answer:
abiogenesis
Explanation:
a (not) biogenesis (coming from other life forms)
Biogenesis would mean that it's coming from other life forms,
Natural selection is a part of evolution (what is there to select?)
Variation is also a part of evolution (not related)
PLEASE HELP ME I NEED CORRECT ANSWERS ON THIS
In snapdragon flowers, the allele for flower color shows incomplete
dominance. Flowers can be red (RR), white (WW), or pink (RW).
4. Two pink flowers are crossed, how many offspring are:
Red?
White?
Pink?
5. A red flower is crossed with a pink flower, how many offspring are:
Red?
White?
Pink?
Answer:
4. There are going to be no red or white flowers. Only pink.
5. There are not going to be any red or white flowers. Only pink.
Explanation:
Pink and Pink make Pink. Red and Pink make Rose Pink.
What is the expected genotypic ratio resulting from a heterozygous ´ heterozygous monohybrid cross?
Answer:
1:3:1
Explanation:
Drawing a Punnett Square helps
HELP PLZ ASAP GIVING BRAINLIEST!!
Answer:
I think D. Loss of Wildlife may be correct
Explanation:
PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA 40 POINTS* DONT SKIP :(( .!
Answer:
most likely b
Explanation:
hopefully this helped
Answer:
C
Explanation:
Since the Ice is its ecosystem then it will have less land to live making it difficult to hunt for prey (the seals). This is actually an effect of global warming.
Please help i need answer ASAP
Answer:
C
Explanation:
A divergent boundary is when the plates move apart from each other. When the plates part, magma from under either plate rises and forms a volcano. A hotspot is the third place a volcano can form. This particular type is the least common.
Answer:
I think A, because b is where the volcano is, c looks like a volcano ready erupted so I might be dormant and may erupt another time. while A is plain surface.
Urgent question!!!!!
Is a thermometer dependent or an independent variable
Answer:
thermometer dependent variable
What organisms went extinct in the Carboniferous period
Answer: Some benthic organisms that were common to early and middle Paleozoic times began to decline during the Carboniferous. These included the trilobites (which became extinct at the end of the Permian), rugose corals, and sponges. The pelagic, or water column, environment was inhabited by a profusion of cephalopods.
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1. Discuss the two types of reasoning and how they are used by scientists to develop and support a hypothesis
Explain why short bursts of light during the dark period caused the Xanthium strumarium plant to not grow.
Answer:
Due to stoppage of reactions.
Explanation:
The short bursts of light during the dark period is responsible for no growth in the Xanthium strumarium plant because this short bursts of light affected the darkness which is required by the Xanthium strumarium plant for its growth. If there is no burst of light occurs, the Xanthium strumarium plant will grow normally but when Xanthium strumarium plant receives the bursts of light, the chemical reactions that needs darkness will stop and as a result no growth occurs.
Which statement best describes biodiversity? *
5 points
A) a geographic area on earth that contains ecosystems
B) The variety of life in a habitat or ecosystem
C) An area that receives very little rain
D) A nonliving thing that affects an ecosystem
Answer:
B)
Explanation:
It refers to all the variety of life that can be found on Earth (plants, animals, fungi and micro-organisms) as well as to the communities that they form and the habitats in which they live.
IT WOULDN'T LET ME ANSWER. NOW YOU SAID TO HELP ME TOO.
What is glucagon's major role in the body?
Answer:prevent blood glucose levels dropping
Explanation:Glucagon's role in the body is to prevent blood glucose levels dropping too low. To do this, it acts on the liver in several ways: It stimulates the conversion of stored glycogen (stored in the liver) to glucose, which can be released into the bloodstream. This process is called glycogenolysis.
What is an oxygen debt? How is it repaid? Explain in detail.
Answer:
oxygen debt a state that arises in very active muscles when insufficient oxygen is supplied by the lungs, causing the muscle tissue to respire anaerobically with the production of LACTIC ACID. When muscular activities slow down, the rate and depth of breathing remains at a high level until the lactic acid has been oxidized. an oxygen debt can be repayed by breathing heavily
Explanation:
