What is a precursor? select one: a. a substance that is used to synthesize another compound b. a sign or symptom of a subclinical vitamin deficiency disorder c. a conditionally essential vitamin d. a substance that is recycled through the liver and intestines e. a sign or symptom of a clinical vitamin deficiency disorder?

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: