Why has the classification system for organisms has changed from seven levels to eight?

Look at the photo of the leaf. which term best describes this leaf?

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 abo controlling alleles could kim give her child