All hormones are made wither from cholesterol or amino acids
a. true
b. false

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 of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?