Question

drag the missing word into place
a lot of evidence supports the of continental drift, which explains why the continents look like puzzle pieces that could fit together.
theory
fossil
natural selection

Explanation:

A theory is a well - supported explanation of a natural phenomenon. Continental drift is a scientific concept that has evidence (like the fit of continents, fossil distributions etc.) supporting it. A fossil is the preserved remains of an organism. Natural selection is related to evolution (how organisms adapt and change over time). Since the sentence is about an explanation (continental drift) that has evidence, the word 'theory' fits.

Answer:

theory