Living systems are made of complex molecules including carbohydrates fats proteins and nuclei caucused. even though there are more than 100 elements known to exist, these molecules are comprised of only a few elements what are these elements? a. sodium potassium calcium nitrogen phosphorus sulfur b. carbon hydrogen oxygen nitrogen sulfur and phosphorus c. carbon hydrogen oxygen fluorine chlorine iodine d. fluorine chlorine iodine nitrogen phosphorus sulfur

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!