4. A -based definition of a target behavior designates responses as members of the targeted response class solely by their common effect on the environment.

answer; i believe the correct answer is ( proteins );

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:

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .