Question

complete the sentence below by selecting the correct words from the drop-down menus. factors that affect natural selection include, , and .

Explanation:

Natural selection is a key concept in Biology (a subfield of Natural Science). The factors affecting natural selection include variation (among individuals in a population), as well as other factors like overproduction (more offspring are produced than can survive) and competition (for resources, mates, etc.). Similarity is not a factor affecting natural selection, but variation is a fundamental one. So the first dropdown should have "variation". (Note: Since the other dropdowns are not fully shown, but for the visible one, variation is correct based on biological knowledge of natural selection factors.)

Answer:

variation