What is artificial selection? A. When a new allele is formed by mutation
B. When humans breed an animal for a certain trait
C. When extreme traits are selected by nature
D. When 60 percent of a species dies at one time

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.

Why are common names a problem for scientist?

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?