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Layers are defined by changes
gradients.
O a. Heat
O b. Density
O c. Temperature
O d. Elevation

as many times as you want

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:

the answer is c.mitochondria. glad to .