A feedback system controls the menstrual cycle. How does a female resp when the luteinizing hormone level drops sharply?
O A. Her progesterone level drops sharply.
B. She ovulates.
C. She menstruates.
D. Her estrogen level drops sharply.

Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.

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.

Aplant may open end close its stomata to prevent excess water loss and maintain