Which of the following cell organelles is NOT found in both plant and animal cells?

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 breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur