(Answered) 1 time hypothesis-communities diversify or gain species

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1. Time hypothesis

-Communities diversify, or gain species, with time

-Temperate regions have less rich communities than tropical ones because they are younger and have only more recently recovered from glaciation

- Support - more worms in comparable unglaciated lakes than glaciated

- Drawback - limited applicability to marine organisms

A couple of questions for the above "slide"

What does the support mean for the time hypothesis? I do not understand what that means.
For the drawbacks - why are marine organisms limited?

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