four groups of scientists, in different parts of the world are dating fossils found in a rock layer of the same geologic time period. to validate the age of their fossils,
the results of their tests would need to be

complex

identical

inconsistent

non-testable

To validate the age of their fossils, the results of their tests would need to be identical.

Explanation:

In order to establish the fact that the rock layers belong to the same geologic period and the fossils found in them are of the same age, it would be mandatory for the researches being conducted to conclude in results identical to each other. Getting similar results would allow the scientists to find out of the exact age of the fossil by comparing various factors involved in the tests.

The correct answer is kettles.

The answer would be  b. hope this !