Which example best illustrates the process of natural selection?

a
Giraffe necks varied in length and all offspring had an equal chance of survival.
b
Giraffe necks varied in length and the shorter neck giraffes were at a disadvantage.
c
Giraffes with the short necks migrated to locations best suited for their neck lengths.
d
Giraffes stretched their necks to reach food, and resulting offspring had longer necks.

Rank the three variables in terms of how strongly they affect the "species" composition of the bacterial communities. place the variable with the weakest effect on the left and the variable with the strongest effect on the right.

In general, did the simulated mice align with your predictions from the punnett squares? yes or no?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.