Answer:
B.
Explanation:
The dependant variable is the one being tested
Answer:
The tiny muscles that make up the iris, known as the circular and radial muscles, relax and contract to maintain a fairly constant level of light entering the eye. In bright light, the circular muscles contract whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye.
Explanation:
As human population increase overtime, Earth’s natural resources will decrease because more of those resources are needed to supply humans.
