approximately what percentage of the human genome consists of repetitive dna or transposable elements?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.

Examine the following diagram. place the labeled layers in order from youngest to oldest.

Which statement about variation is true? a) all phenotypic variation is the result of genotypic variation. b) all genetic variation produces phenotypic variation. c) all nucleotide variability results in neutral variation. d) all new alleles are the result of nucleotide variability. e) all geographic variation results from the existence of clines.