A plant or animal that carries a disease or parasite during part of its life cycle is called a(n):

When analyzing tree rings, what do scientists assume a thin ring indicates?

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.

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?