Help on the question above

C because energy is not recycled and not all the energy is passed from one level of the food chain to the next. Energy may be lost as heat (released during respiration), through movement, or in materials that the consumer does not digest. matter is recycled in ecosystems. Decomposers release nutrients when they break down dead organisms and these nutrients could be used by plants

the answer is C

Explanation:

the reason is because the energy is not recycled.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72