Which best matches a list that a scientist would make to describe a forest ecosystem?

a. different types of animals and plants, and the forest soil.
b. an animal species, the soil, water, and nutrients.
c. all the living things in the forest ecosystem.
d. different types of soil, rocks, and water sources in the forest.

The correct answer would be a. different types of animals and plants, and the forest soil.

This is because an ecosystem is made by interaction of both living (biotic- both plants and animals) and non-living (abiotic such as air, water, land, soil etc) things in a particular area.

In option b. only one species of animal is mentioned, hence, it is not a correct answer.

In option c. abiotic components are not mentioned and thus it is not correct.

Similarly, in option d. only abiotic components are mentioned and there is no description about biotic components. Hence, it is also incorrect.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%