What proteins are vital to living things because they speed up chemical reactions by up to a trillion times

The answer is; enzymes

These proteins have active site in which the reactants bind and are catalyzed. Enzymes work by lowering the activation energy of reactants hence speeding the rate of reaction. In most cases, these reactions in the body would not happen spontaneously in the environment, due to the high activation energy required, but do so in the body due to the presence of enzymes.

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: