Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.

A) The layer changed from land to water

=> From the fossil of the fish, we can say that the fish used to live in that area From the other fossils, we can tell that land animals lived there first before the fish appear due to the fact that the layer cointaining the bone and tooth is older -> that layer appeared first, which can only mean one thing: that area changed from land to water.

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