It changes in proteins in the eye to enable vision.
Density is a measurement that compares the amount of matter an object has to its volume. An object with a lot of matter in a certain amount of volume has high density. ... When water freezes, it makes ice that is less dense than liquid water.
Explanation:
time is nature's expression of change.
every change takes time.
it takes time to e.g. move from A to B.
at one point of time the universe is in one state, then some change happens, and the universe is in another state, and we have another point of time.
without time there is no change, without change there is no time.
Answer: D:
A periodic disturbance of a medium
Explanation:
A wave can be Mathematically defined by periodic disturbance of a medium. That is, oscillations of the waves about a fixed position or change in position from the resting equilibrium position. The wave oscillate from equilibrium position with amplitude periodically.