What are the important sub stances that the circulatory and respiratory systems deliver to body cells? Why are these substances important? Give two examples of
wastes that the excretory system removes from the body.

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

Which statement best describes the first stage of cellular respiration? check all that apply