Question

one piece of evidence that supports the theory of plate tectonics is the discovery of what in both south america and africa? fossil remains of the same land - dwelling animal. the ancient atmosphere in both places was identical. plants on both continents have similar flowers. the rates of weathering of rock are similar.

Explanation:

Land-dwelling animals cannot cross open ocean, so identical fossil remains of these animals on South America and Africa indicate the continents were once connected, supporting plate tectonics. The other options are not strong evidence: ancient atmospheres being identical is not specific to plate movement, similar modern plant flowers can result from convergent evolution, and similar rock weathering rates depend on current climate, not past continental positions.

Answer:

Fossil remains of the same land-dwelling animal.