Answer: Option A.
Different beaks were available
Explanation:
Variation is the difference between traits, cells, or characteristics between organisms of any species which is caused by change in genetic information or effect of environmental factors on the expression of genes.
From the question, different beaks were available because there is variation or differences in shapes, sizes and expression.
Different monomers contain different kinds of atoms needed to produce different end products
The first step the biologist needs to make an observation in which to create a hypothesis.
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