A woman is pregnant with her third child. Her doctor is concerned that the fetus may have an extra chromosome 21. What would be the best method to determine if this is true

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