Why does the heart start pumping blood to all the cells so early in pig/human development

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

Why is excretion necessary to maintain homeostasis?

How will you manage your time to accomplish the necessary tasks both on the job and at home?