What are the purposes of theories in science? and

what makes a theory a “good theory”.

They are testable predictions to help scientists understand a phenomenon.

A "good" scientific theory should be: predictive, testable and explanatory.

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:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves