Describing Natural Selection
Which statements best describe natural selection? Check all that apply.
Populations must have genetic variation.
Genetic mutations do not produce advantageous traits.
Natural selection occurs when the environment changes.
Evolution works independently of natural selection.
Organisms best suited for the environment survive and reproduce.

The segments shown below could form a triangle.

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

In their competition for power nations raced to