What is the difference between sister chromatids and homologous chromosomes?

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Which would be the most useful source of evidence to support mcneill's contention?

What are the three types of counseling established by marine corps policy?