What is the name for the muscular contractions that push food through the digestive system 1. Villi
2. Peristalasis
3. Elimination
4. Pepsin

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Because of its structure the cell membrane is known as a phospholipid ? a.bilayer b.molecule c.fluid d.barrier

Which organelle releases chemicals that break down large food particles into smaller ones?