What is responsible for the peristalsis that occurs in the digestive tract?

Peristalsis moves food through the digestive system. When muscles contract, food is pushed to an area of relaxation. The muscles above the food contract further, pushing the food along. It occurs in the esophagus and intestines.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg