B is the correct answer because the independent variable is what is being tested. The dependent variable is what the outcome is. Maybe that will help for future reference
Answer:
Every fossil tells us something about the age of the rock it's found in, and index fossils are the ones that tell us the most. Index fossils (also called key fossils or type fossils) are those that are used to define periods of geologic time
Explanation:
PLAY. <span>Control. The part of an experiment that is not being tested and is used for comparison.
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