Which phrase describes a scientific theory? a. a proposed explanation that can be tested b. an observation that leads to a question c. a thoroughly tested and widely accepted explanation d. a description of how elements of nature will behave under certain conditions

A thoroughly tested and widely accepted explanation describes a scientific theory.

Explanation:

"a.) well–developed vascular system."

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: