The nucleus is the part which controls the cell and is semipermeable
Trypins breaks down the protien into simple amino acids which are absorbed by the gut wall.
Answer:
P waves are compressional which means they move through a solid or liquid by pushing or pulling similar to the way the sound travels through air, the particles of the material a P wave pushes through moves in the direction of the P waves energy, this is called the direction of wave propagation
