Both mitosis and meiosis begin with a diploid cell that contains replicated chromosomes.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d