Why does the combination of respiration and photosynthesis allow a sealed environment to survive almost indefinitely? A. They recycle each other's materials.
B. They do not allow a sealed ecosystem to survive.
C. They each sustain a different part of the food chain.
D. They create new energy to be used.

A. They recycle each other's materials.

Explanation:

Respiration brings out carbon dioxide which is good for photosynthesis.

And photosynthesis also brings out oxygen used for respiration.

Hope it helps.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: