Can somone help me plz

tissue

explanation:

it is actually formed by geoup of cells which is tissue

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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: