Much like a cell, a virus is able to a. respond to its environment. b. obtain and use energy. c. change over time. d. grow and develop.

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

The cluster of developing cells from conception until birth is called an

What are examples of the plant life and animal life that can be found in each type of terrarium