Under which of these conditions would scientists use the polymerase chain reaction(PCR) before they analyze a DNA sample A. The DNA sample comes from the bacterium or virus
B. The DNA sample has been cut into fragments by restriction enzymes
C. Only a small amount of the DNA sample is available
D. the DNA sample includes regions that are transcribed into mRNA

Reviewing natural selectionhtquick checkmatch each scenario with the correct component of natural selection. on average, sea turtles lay about 110 eggs in a clutch. however, only a fraction of thebaby turtles make it to the ocean. then, an even smaller number have offspring of their own." while all zebras have stripes, no two zebras share the same stripe pattern. a lemur species called aye-ayes have very long, thin middle fingers that allow them toreach into holes in trees and dig out bugs to eat. done7intro