The amount of matter that cycles through a food web

The correct answer will be- does not change

Explanation:

A food web represents the complex interaction of the organisms in an ecosystem through which energy and matter flow.

The flow of matter in a food web is not like the energy flow which decreases at each trophic level. The matter is recycled between and with an ecosystem where matter can enter and exit at any level.

Since the matter in an ecosystem is recycled by the decomposers, therefore, the amount of matter does not change.

Thus, does not change is the correct answer.

answer; (phospholipid);

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.