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which of the following is true of red blood cells?
a. once created in bone marrow, they circulate for our lifetime
b. they live for only 120 days
c. they live for only about 20 days
d. they have multiple nuclei

What element does susan b. anthony include in this passage to strengthen her argument?

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

Compare the two theories regarding the evolution of dinosaurs and then consider the cladogram above. although the two theories differ on the evolutionary path of dinosaurs, they agree that