Humus which is formed by the decay of plant and animal matter is important for the formation of most, a) rounded sediments,
b) soils,
c) surface bedrock,
d) minerals

b) soils.

Explanation:

Humus which is formed by the decay of plant and animal matter is important for the formation of most, soils.

Soil formation occurs as a result of the the decay or the remains of plants and animals which are used up.

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kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above