Question

these discoveries led to a fundamental concept of biology; -- which states : 1) 2) 3) cells vary in size, and shape, but they all have two characteristics in common. 1) all cells have a barrier called a 2) all cells contain cells are divided into two broad categories:

Explanation:

The fundamental concept of biology being referred to is the cell - theory. It states that all living organisms are made of cells, cells are the basic unit of life, and all cells come from pre - existing cells. The barrier in cells is the cell membrane and all cells contain genetic material. The two broad categories of cells are prokaryotes and eukaryotes.

Answer:

The fundamental concept: Cell - theory
Cell - theory statements:

1. All living organisms are made of cells.
2. Cells are the basic unit of life.
3. All cells come from pre - existing cells.

Barrier in cells: Cell membrane
Content in cells: Genetic material
Two broad categories of cells: Prokaryotes, Eukaryotes