Imagine a population of rabbits in which most of the rabbits are brown all year. Then a mutation occurs, and one rabbit is born with a coat that turns nearly white in the winter. How might this white coat present an advantage to the rabbit? A. The white coat would help the rabbit stay warmer than a brown coat.
B. The white coat would help the rabbit hide from predators when snow fell during the winter.
C. The white coat would help the rabbit attract a mate more easily than a brown coat.
D. The white coat would help the rabbit stand out against the greens and browns of summer foliage.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!