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_ systems have a membrane that separates the internal chemicals from the external chemical environment.
0 Living
O Chemical
both a and b
none of the above
Answers: 3
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Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.
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Which muscle cell structure stores calcium ions that are used to trigger the contraction?
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_ systems have a membrane that separates the internal chemicals from the external chemical environme...
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