Where does light first enter the eye? lens cornea retina pupil?

What came first the elephent or the crocodile

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.

What are the proteins in connectivity tissues of your foot examples of?