Question

darwin wrote that organisms with traits that are best suited to the environment will ----------
become extinct
increase in number

Explanation:

Darwin's theory of natural selection states that organisms with traits well - suited to their environment are more likely to survive and reproduce, which leads to an increase in their number within the population. Organisms with less - suited traits are more likely to become extinct. So, organisms with traits best suited to the environment will increase in number.

Answer:

increase in number