Answer:
DNA and RNA are both molecules that contain genetic information and are made up of nucleotides.
Answer:
The correct answer is option A. "directional selection".
Explanation:
Directional selection is a type of natural selection at which traits with extreme characteristics are selected over traits with medium characteristics. In this case, a long-term climatic change resulted in all seeds that are the fountain of food for finch becoming hard. This will result in a directional selection on bill size in the finch population, where large-billed birds will be selected over small and medium-billed birds.
I would say,
Aa.
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How a bridge is built at the base can affect how far it can extend.