What is the main source of Earth's light?

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

Which is the function of the hypothalamus in thermoregulation? answers: -sensor -effector -stimulus -intergrating center it's either a or c i believe

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false