Awaste product of respiration in animals that is used by plants to carry out photosynthesis is a. carbon dioxide. c. calcium carbonate. b. carbon monoxide. d. sodium bicarbonate.

The correct answer is- A. carbon dioxide.

Respiration is a metabolic process ( that occurs in all life forms) that involves the formation of energy in the form of ATP ( adenosine triphosphate) from the oxidation of organic substance ( such as glucose).

It typically involves the intake of oxygen that is inhaled by the organisms and release of CO2 ( carbon dioxide) as a waste product ( exhalation of CO2).

Carbon-dioxide is used by plants along with water in the process of formation of food ( photosynthesis). This process occurs in the presence of sunlight, which is absorbed by green plants and algae and converted into chemical energy in the form of ATP and NADPH that is finally utilized for synthesis of food ( glucose).

Thus, option A) is the right answer.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint