According to the plate tectonics model, what layer from earth's rigid, mobile plates?
a. inner and outer core
b. upper and lower mantle
c. crust only
d. crust and upper mantle

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca