AP BIOLOGY

Detailed explanation-1: -Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That’s because all cells are surrounded by a structure called the cell membrane-which, much like the walls of a house, serves as a clear boundary between the cell’s internal and external environments.

Detailed explanation-2: -A cell is the most basic unit of life. Anatomically, it is a membrane-bound structure that contains various other organelles which perform specialized functions.

Detailed explanation-3: -Cells are made of molecules, which are much smaller than cells, and molecules are made of atoms, which are even smaller! At the same time, many cells put together make much larger structures.

Detailed explanation-4: -Cells are the structural and functional units of life because a cell is capable of independent existence and can carry out all the vital functions for living. A cell carries out functions like nutrition, respiration, excretion, transportation and reproduction; the way an individual organism does.