HIV, the virus that causes AIDS, is a retrovirus. Which of the following sentences BEST defines a retrovirus? A. A retrovirus converts DNA into RNA,

B. A retrovirus causes lifelong infection.

c. A retrovirus is an old virus that infects new cells.

D. A retrovirus inserts DNA into the host cell's genes.

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat.o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat.habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.

Acquired mutations can result from radiation pollution toxins inheritence select all that apply

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.