Dichotomous Keys are arranged in set of couplets.

True
False

True

Explanation:

Conventional dichotomous keys consist of a series of paired choices called couplets. Each couplet presents the user with two alternative and exclusive sets of characters that distinguish one group of organisms from the other.

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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:

layer 3 is younger than layer 6.