Which two pioneer species help break up rock to create a substrate rich in organic
material. Starts the process of creating
soil in a newly created environment.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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може ли да зареждате повече информация, моля