Which factors are used to characterize a biome, such as the desert, tropical rain forest, or temperate grasslands? Select all of the answers that apply.
A. biotic factors, such as plant and animal life
B. abiotic factors, such as climate and soil
C. precise lines of latitude and longitude
D. levels of greenhouse gases in the atmosphere

Biotic factors are those which are living organisms that shape an environment. The examples of biotic factors are aqueous plants and animals.

Abiotic factors are those which are non living and helps shape the environment. The examples of abiotic factors are rain, sunlight, soil and water.

Both of these factors are important to shape an environment and ecosystem.

The correct answers are :

a. biotic factors, such as plant and animal life

b. abiotic factors, such as climate and soil

Learn more at link

it would lead to upper respiratory infections and pneumonia.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%