3. The cooling rates of igneous rock determine which of the following? a. the number of igneous rocks that form
b. the size of the crystals that form in the rock
C. cooling rates are not used in determining igneous rocks
d. both the number of igneous rocks that form and the size of the crystals that form within the rocks

1. B

Explanation:

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the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.