When food moves through the esophagus, the muscular contractions are wave-like. nutrients are absorbed in the esophagus. skeletal muscle carries out all of the muscular contractions of the wall. the muscular contractions are entirely involuntary. gravity is necessary to move food toward the stomach?

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