Which of the following examples likely occurred through natural selection?
A.
In a litter of puppies, some puppies have brown fur while others have black fur.
B.
Some humans have hair on the middle part of their fingers, while others do not.
C.
There are several colors of roses, such as red, white, pink, and yellow.
D.
Giraffes have longer necks than their ancestors.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

What advantages does a pedigree have over a written passage?