Earthworms contribute to decomposition by A. breaking down matter into inorganic nutrients through mineralization. B. breaking up litter into smaller particles, thereby increasing the surface area and allowing for more efficient chemical breakdown. C. releasing enzymes that convert inorganic molecules into organic macromolecules. D. decreasing the amount of oxygen in the soil, thereby increasing mineralization.

B. breaking up litter into smaller particles, thereby increasing the surface area and allowing for more efficient chemical breakdown.

Explanation:

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the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands