In a meadow where earthworms live in the soil, the ph gradually decreases from the optimum range into the zone of stress. what is the most likely effect on the earthworm population? a. the size of the earthworm population increases, but otherwise the population is unchanged. b. the size of the earthworm population decreases, but otherwise the population is unchanged. c. earthworms that tolerate high ph become more common in the population. d. earthworms that tolerate low ph become more common in the population.

ANSWER: D, earthworms that tolerate high pH become more common in the population.

REASONING: This is a result of natural selection.  Natural selection is a process in which organisms that are better adapted to their environment will likely survive and reproduce more than those less adapted to their environment.

Option D

Explanation:

When the pH of the soil changed from the optimum level to the stress level then only the stress tolerant earthworm would be left in the soil.

The earthworm that can tolerate the low pH will be common in the coming generation of the earthworm because only fittest will survive and reproduce.

Due to this reason the low pH tolerant population of the earthworm will be common.

So, the correct answer is option D

you can't see the options

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.