What is the source of the oxygen released into the air as a product of photosynthesis?
a. chlorophyll
b. carbon dioxide only
c. water only
d. both water and carbon dioxide

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Which type of stimulus do mechanoreceptors detect? sound pain heat light

Using meiosis, the sporophyte produces spores that are .