Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?

a. fluffing decreases the amount of heat loss by conduction when the bird makes contact with cold objects in its environment
b. fluffing creates a pocket of air near the bird that acts as insulation
c. fluffing decreases the surface-area-to-volume ratio, thus decreasing the amount of heat loss to the environment
d. fluffing feathers results in less cooling by radiation because feathers emit less infrared radiation than other tissues do

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule