At which population growth rate is the coal supply on earth expected to last the longest
a. high growth
b. average growth
c. no growth
d. low growth

C. no growth

Explanation:

Coal is fossil fuel, its supply is limited and it takes millions of years to form. We humans use a lot of coal to meet our energy needs. The higher the population growth, the greater the need for energy and more coal will be taken from the earth's coal supply. One day this supply will run out as the population keeps growing.

For coal supplies available on earth to last longer would require no population growth, so our energy needs would not grow as it would be equal to the size of the population we now have.

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

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.