Fossil remains of Lystrosaurus (an extinct four-legged animal) have been discovered in India and South Africa. When they were living, all the
Lystrosaurus lived together on land, and they could not swim. However,
now there is an ocean between the Lystrosaurus fossils. What could
explain how these fossils got so far apart?

India and South Africa are parts of different plates. The plates slowly moved apart as new plates from underneath got added between them over millions of years.

Explanation:

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An experiment that is conducted within a controlled environment  is known as a controlled experiment, similar to a controlled variable.