D. These options may contribute to a more likely successful marriage, but none of them are required.
Chemical signal can signify the lymphatic, nervous and endocrine system.
Mostly endocrine, the endocrine system is the body system responsible for providing the needed hormones for the body. These hormones and body fluids contribute and catalyse the growth, disposition, sex characteristics and other potential corresponding output of these hormones.
1. Receptors in muscles provide brain with information about body position and movement.
2. Brain controls the contraction of skeletal muscle.
3. Nervous System regulates the speed which food moves through the digestive tract. H
<span>Cells are considered living things because they all the basic structures of life within the cell in order to operate while subcellular structures such as mitochondria is not considered alive because it can not operate on its own</span>
