Many scientists are worried about some of
earth’s finite resources because humans are
(1) using carbon dioxide faster than it is being
produced
(2) placing industrial wastes in landfills
(3) interfering with energy flow from consumers
to producers
(4) using large amounts of some materials that
cannot be renewed

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Which of the following is a testable hypotheses?

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin