If you use more than one independent variable at a time, and will observe a change, you will not know which variable contributed to a changed result.
Water is a polar molecule because its opposite ends have opposite electric charges.
Neurological - by nerves
Endocrinological - by blood and secrets
Answer:
Enzymes help speed up chemical reactions in the human body. They bind to molecules and alter them in specific ways. They are essential for respiration, digesting food, muscle and nerve function, among thousands of other roles.
Explanation:
