Which genotype relative to the sickle-cell allele has the greatest reproductive success in regions where malaria is a common disease? a. the heterozygous genotype b. the homozygous recessive genotype c. the homozygous dominant genotype d. all genotypes have equal reproductive success

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.

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel