Help Please Cell membranes are very important for all cells, because their selectively permeable structure allows materials to enter and exit the cell through passive and active transport.

This is possible because cell membranes have a which allows both surfaces of the membrane to interact with water and other molecules.

A. Carbohydrate wall

B. Protein trilayer

C. Phospholipid bilayer

Free brainliest! what is a characteistic of the american stradfordshire?

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.