This document discusses cells and their structures. It begins by introducing microscopes and how they allow the viewing of cells. It then outlines the cell theory, which states that all living things are made of cells, new cells are produced from existing cells, and cells are the basic functional units of life. The document describes the two main types of cells - prokaryotic and eukaryotic - and provides details on animal and plant cell structures including organelles like the nucleus, chloroplasts, mitochondria, cell wall and cell membrane. It concludes by noting the functions of organelles in cells.