Which of these statements is true about autotrophs, but not heterotrophs?

they use sugar and oxygen to make carbon dioxide and water.

they use chlorophyll and oxygen to make carbon dioxide and water.

they use sunlight, water, and carbon dioxide to make sugars.

they use sunlight, water and oxygen to make chlorophyll.

The correct statement is - they use sunlight, water, and carbon dioxide to make sugars.

Explanation:

Organisms can be divided into autotrophs and heterotrophs according to their pathway of producing food and energy.

Those organisms that are able to make and produce energy from energy-containing organic molecules such as glucose from inorganic raw material such as water and by using light energy such as sunlight are autotrophs. Plants are the prime autotrophs, they produce their food and energy which is sugar from water, sunlight and carbon dioxide using photosynthesis.

Heterotrophs are that organism who depend on another organism for their food and energy. They get their energy from carbohydrate, protein, and fat.

Thus, the correct statement is- They use sunlight, water, and carbon dioxide to make sugars.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation: