What is the fourth stage of the estrous cycle where, if no pregnancy occurs a drop in hormone levels prepares the reproductive system for the estrus the first stage of the cycle? A: Diestrus
B: Estrus
C: Metestrus
D: Proestrus

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.

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Which of the following is required of a new drug?me