I think the correct answers are the half-life varies depending on the isotope, half-lives range from fractions of a second to billions of years and <span> half-life of a particular isotope is constant. Half-life is a constant value for a specific isotope that tells when does the mass of the isotope reduces to half of the original mass. Hope this helps.</span>
Answer: how a virus differs from a cell...
It doesn’t contain any kind of cytoplasm, cell wall, cell membrane, ribosome or mitochondrion.
It doesn’t have any sort of metabolic enzyme of its own. So, no nutrition system is seen.
It can’t reproduce itself, without any help of the host living cell.
It can be crystallized, centrifuged or diffused.
It doesn’t have any sort of somatic development.
Chemically, its just a fusion of protein and nucleic acid. So, this characters differ a Virus from a living cell.
Explanation:
Answer:
D) sympatric speciation and habitat isolation
Explanation:
Sympatric isolation is a form of evolutionary process whereby different species from an ancestral origin evolve within the same geographical environment as a result of reproductive isolation.
Habitat isolation is a form of reproductive isolation which occurs when two populations of a species inhabiting overlapping habitats become unable to interbreed with each other.
Reproductive isolation (habitat isolation) that occurs in the fleas is as a result of the new species becoming separate from it's ancestral species which feed only on pronghorn antelopes, although both species can still be found in the same geographical location (rangeland). The new species now have preference for cattle blood, and so are now found on cattle.
In the situation of the two new species of flea that would evolve, it can be said to an example of sympatric speciation and habitat isolation, since the host mammal is assumed to be their habitat and both the cattle and pronghorns often associate with one another in the same open rangeland.
Answer:
Producers get energy from the sun
Primary Consumers get energy from producers
Secondary Consumers get energy from Primary Consumers
Tertiary Consumers get energy from Secondary Consumers
Explanation:
hope this helps!
Answer:
The telescope can see galaxies really far away, and it can "remap" time, to give a view of what it would've looked like
Explanation:
