Respiration involves respiration involves a photochemical reaction involving carbon dioxide and water to produce carbohydrates and oxygen. the use of heat energy to react carbon dioxide with water to produce oxygen. a chemical reaction between carbohydrates and oxygen to produce carbon dioxide, water, and heat energy. a photochemical reaction involving carbon dioxide and oxygen to produce water and oxygen.

The correct option is: a chemical reaction between carbohydrates and oxygen to produce carbon dioxide, water, and heat energy

Explanation:

Respiration refers to the catabolic reactions in the cells that produce energy in the form of adenosine triphosphate (ATP) from various nutrients.

An aerobic respiration, is a spontaneous process that involves the use of molecular oxygen (O₂) to produce energy (ATP). In this process, molecular oxygen oxidizes nutrients such as carbohydrates, fats, and proteins; to give carbon dioxide, water and heat energy.

the answer would be c

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.