Question

Which phrases describe oxygen's roles in Earth’s atmosphere? Check all that apply. allows fuels to burn forms clouds that produce rain is the gas that animals breathe is used by plants to produce food forms ozone that absorbs the Sun's harmful rays

Answer 1

Oxygen: Oxygen is one of the essential gases for the living beings to survive. The plants produce oxygen as a result of photosynthesis and it has a wide range of role in Earth's atmosphere.

Roles:

• Allows fuels to burn - Oxygen is the reason for combustion
• Is the gas that animals breathe - Survival is possible only because of oxygen.
• Forms ozone that absorbs the Sun's harmful rays - Ozone layer is made up of O3 which is oxygen.

Answer 2

The demographic information for a particular population represents the information such as age, gender, occupation, income etc.

From the data collected, there are some positive trends being reflected.

There is a significant increase in life expectancy as death rate has reduced.

This is because of the advancement in science and medical care.