ATP is the resource by which the cell gets everything done. ATP is spent in a similar way as money is. ATP is used for its energy to help the cell run efficiently. It earns ATP through energy creation, then has to spend it to perform other vital functions.
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Answer:
This can be caused by mating differences, sterility or environmental barriers that eventually lead to the adaptive splitting into two species. ... However, reproductive isolation is not sufficient but internal barriers to gene flow are required for speciation to evolve.
Explanation:
I hope this helps I'm not so good at explaining.