Answer: c. disease
Explanation: A state of good health and a state of disease is a gray zone of suboptimal health.
A redshift can be described as a galaxy that is moving away form us. So the correct one is D.
Answer: a characteristic of having a high spread rate can mean the invasive plant will have a faster population growth rate which can over crowd native plants. Tolerance to different climates is also beneficial in which it means it can grow in many different places, improving the chances of survival
Explanation:
I believe it is restorative theory because it’s believed through this theory that sleep is necessary to the physical health of the body
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