Over various spans of time, human populations have increased, decreased, or remained the same, and at both global and local levels. Which
statement best explains this observation?
A
Unlike other populations, the human population changes size because of specific choices of its members.
B. Unlike other populations, the human population has the ability to grow rapidly without limit
C
Like other populations, the human population is affected by a variety of factors in the environment
D. Like other populations, the human population increases and decreases in a cyclical pattern.

The correct option is C) Like other populations, the human population is affected by a variety of factors in the environment.

Explanation:

According to the theory of natural selection, those organisms which are better able to live and survive in an environment are able to live and reproduce. The same case goes in the scenario of humans.

Certain environmental factors make the Earth favorable enough for humans to multiply rapidly. Other factors such as a disease or infection outbreak may result in unfavorable conditions for the humans. As a result, the population of humans will decline.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.