20. The shape of a protein molecule resembles a. a messy group of coat hangers
b. beads on a string
c. a flat stack of straight chains
d. neatly folded dishtowels

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

What is the most abundant vertebrate on earth?

Why did the federal government end its support of yucca mountain as a site for long-term storage of nuclear water