A pond ecosystem remains about the same for many years. Then beginning one year, fertilizer from a new housing development is washed into the pond water. More fertilizer is added every year. As explained by Darwin's theory of natural selection, which of these events is likely to occur? I. Some populations of the pond will increase in number.
II. Some populations of the pond will decrease in number, possibly to zero.
III. New populations will arrive in the pond.
a
II. only
b
I., II., and III.
c
I. and II.
d
II. and III.

The answer is A.

Explanation:

When excess of fertilizer is added to the pond, the population of organisms in the pond will decrease due to the lacking of oxygen.

(Correct me if I am wrong)

b. read the phase at the intersection of any given temperature and pressure.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: