A verticle group (up and down) is called a GROUP. The horizontal groups (left to right) are called PERIODS
Answer: d
Explanation:
these are visual/optical waves
<span>photosynthesis i believe
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A molecular clock is a method used by researchers that uses mutation rates in DNA to estimate the length of time that two species have been evolving independently. This provides evidence of evolutionary descent because it can link to common ancestors.
Hypothesis
Because hypothesis is hypothetical speaking so it’s just a guess on background information