When a person does strenuous exercise, small blood vessel’s near the surface of the skin increase in diameter. this allows the body to be cooled. characteristic of life does this best illustrates? a) excretion b) homeostasis c) adaptation

Which particle controls what element an atom is?

Organelles found in plant cells that function through photosynthesis to produce glucose from carbon dioxide and water are called — question 21 options: chloroplasts guard cells photosynthons

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.