The compressor in an ac system is least likely needed to a. keep refrigerant circulating. b. make gas hotter than ambient air. c. increase the gas pressure. d. lower the gas pressure.

The diagram shows the results when two parents are crossed. the letters represent alleles for a trait that is controlled by three different genes. which best describes this inheritance pattern? multiple allele because a trait is controlled by three different genes polygenic because the offspring have alleles from both parents multiple allele because the offspring have alleles from both parents polygenic because a trait is controlled by three different genes