An ecological pyramid a. maps out feeding patterns in a food chain. b. illustrates trophic levels in an ecosystem. c. describes biogeochemical cycles. d. defines specific levels of an ecosystem.

Which statement about the pancreas is not true? a. it is an endocrine organ in the abdomen. b. it release chemicals into the digestive system. c. it releases insulin to increase glucose levels. d. it release hormones into the bloodstream.

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

In what ways does the study of human population differ from the study of wildlife ecology