When there are different amounts of a substance on either side of the cell membrane, (a) gradient results.

A cell membrane is a delicate sheet that separates one region from another, it selectively or completely allow the passage of different amounts of substance on either side, which a concentration gradient results. An example of this is diffusion where there is a net movement of substance from the area of higher concentration to the area of lower concentration.

i'm on my way to history not a mistory.

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation