Answer:
Wave
Explanation:
These are characteristics of a wave.
the heart has valves in place to prevent the backflow of blood.
Answer:
Option (D)
Explanation:
Environment refers to all the living and non-living components that surround us. There occur various processes such as precipitation, evaporation, weathering and erosion, deposition, and the processes that are associated with the various cycles such as geochemical cycle, nitrogen cycle, carbon cycle, phosphorous cycle and so on.
These processes occur in all the regions on earth and at different rates, and they are comprised of energy that is constantly in the flow from one region to another. These environmental changes and the forces that are involved in it are dynamic in nature.
Thus, the correct answer is option (D).
This is a very confusing question since it sounds more like a statement. sorry really wish I could help :(
