The SI unit for speed is meter per second (m/s). Speed can be calculated by the formula: speed = distance/time.
Had to look for the options and here is my answer.
The answer that best fits the blank above is PRINCIPLE OF FOSSIL SUCCESSION. This principle states that fossils appear in an order chronologically in a vertical manner. Hope this answers your question.
Answer: I know there is one similarity and that is that they both have 2 Oxygen atoms.
Explanation: sorry that's all i've got :(.
I believe the answer is...
Bioconversion
Learning Experiences would be the correct answer