Which organisms fertilize their eggs externally or internally?​

Four types of motile cells in human body?

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 of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above