Which discovery provides the most evidence to support the idea that two
species may have had a common ancestor?

a they possess four limbs which they use for movement.

b. they reproduce sexually.

c. they have a high percentage of similar genes.

d. they live in the same habitat.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.