Plywood grades are (best to worst) A, B, C and D for face or front face. The back grades are (best to worst) 1, 2, 3, and 4. Plywood grading standards are published by the Hardwood Plywood & Veneer Association.ardwood Plywood Grades Here's a concise explanation of hardwood plywood grades and what they mean.
Cell (biology) The cell (from Latin cella, meaning small room) is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the building blocks of life. The study of cells is called cell biology.
Cell has several different meanings, but all of them are similar. Whether it's in a prison or in your blood (or even in the political landscape), a cell is a small room, space, or unit. Blood is composed of countless individual cells, as are virtually all of the organs of the body: skin, liver, lungs, brain, etc. The cell is the basic unit of all biology. A cell in a prison is the room in which a prisoner lives.