Speed. This is more of a physics question.
Answer:
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain.
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:
Brain and spinal cord are the components of central nervous system.
