How do you determine the atomic mass of an element with 20 electrons and 17 neutrons?

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.

The law of states that traits are passed from parents to offspring independently of one another.. true or false

Which component cannot be part of this strand?