In a population, there are 500 cats. What is the frequency of black cats if 300 are calico?

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 is the next step in muscle contraction after the actin changes shape? (apex)

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?