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

phospholipid layer

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.