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Intrusive igneous rocks cool from magma slowly because they are buried beneath the surface, so they have large crystals.
Extrusive igneous rocks cool from lava rapidly because they form at the surface, so they have small crystals.
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RNA polymerase is guided to the correct place.
A successful food web needs to have all of the organisms mostly bigger than the ones that they are eating otherwise the food web wouldnt neccessarily work properly and then the food webs would all be messed up.