Which energy source is used most for all types of energy used in the U. S.? A. natural gas B. coal C. nuclear D. petroleum

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 substances most likely dissolve in water? check all that apply •paraff

Which degree of tilt produced light similar to what north america experiences in summer? explain your answer?