Practice 2 Answer the following questions on the distribution of traits caused by natural selection. Darken the circle
that corresponds to your answer choice.
1. In a tropical habitat, a variety of hummingbird species use their bills to feed on flower nectar. If a population of
hummingbirds enters a new habitat with an abundance of trumpet vine plants that have longer flowers, those
individuals with slightly longer bills will be favored in the new environment. Those hummingbirds with
medium-length and shorter bills are less successful. Which type of natural selection is at work in this example?
stabilizing selection ® disruptive selection © directional selection O bilateral selection

Chicken pox and hepatitis are bacterial diseases. true or false?

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

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page