HELPP Select the correct answer. Which method of testing substances is a sure way to identify a chemical reaction? *

A. change in color
B. Change in density

actually it should be a formation of bubbles that identifies a chemical reaction.

answer; /// i believe that the correct answer is (50%);

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: