Which of the following microbes cannot reproduce unless it first infects a cell in a host organism? A.
parasites
B.
bacteria
C.
protozoa
D.
viruses

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

What are two reasons for why a species might disappear from the fossil record?

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?