According to the law of conservation of matter, in any food chain we know that

Energy is being transferred from one trophic level to the other. However all the energy is not transferred as a lot of it is lost as waste matter.

Answer;

matter is changed into various forms but the total quantity remains unchanged.

Explanation;

According to the law of conservation of matter, in any food chain we know that matter is changed into various forms but the total quantity remains unchanged.

According to the law of conservation of matter, matter is never created or destroyed. In a food pyramid the amount of biomass decreases as we move up through the pyramid, from producers to top level consumers.

-The second law of thermodynamics says that energy always moves from a high usable level of energy to lower less usable forms of energy. The food used by organisms has a high level of usable mass and energy. When the food is burned the mass and energy is at much lower level of usable energy and mass. The mass released as Carbon Dioxide and Water are lost to the food pyramid.