The answer is C. Amount of water because a constant variable is a variable that stays the same and the amount of water is constant throughout the experiment
The type of fish that has a flexible skeleton made of cartilage is known as a Cartilaginous fish.
I think the correct answer would be the third option. El nino is best described as having unusually warm air temperatures. This weather pattern is a result of the warm temperature of the Pacific Ocean which is located near the equator.
The existence of an Individual human being or animal