He system works with the nervous system to protect important organs such as the brain and spinal cord. a) skeletal b) lymphatic c) endocrine d) cardiovascular

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!

Which of the following describes what an activator an enhancer are