Which seeds are usually nursed?

Oats are the most common nurse crop, though other annual grains are also.

Explanation:

Nurse cropping of tall or dense-canopied plants, may protect more vulnerable species through shading or by providing a wind break.

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multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

d. cellulose and starch