Help.. 12. Two organs that are not part of the digestive system, but that secrete substances into the small intestine to aid digestion, are the liver and the
13. vitamins cannot be stored in fat tissues.

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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:

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