Which of the following does NOT secrete hormones? A. Skin
B. Ovaries
C. Pancreas
D. Adrenals

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

What are 3 reasons that natural selection occurs