Why do some life activities strengthen the substrate and others weaken it?
A) Burrowing creatures distribute stronger soil around, whereas plants digest and weaken soil.
B) Burrowing creatures distribute stronger soil around, whereas plant roots wedge soil apart.
C) Plant roots help anchor soil, whereas burrowing animals can weaken it.
D) Some organisms secrete a binding agent in the soil, whereas plants digest and weaken soil.
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