Pls its for my grade and im in biology so i don't know what subject ti put if science or biology

What causes darkening of the skin as melanin production increases

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?

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!