Study of animals that live in

Study of structural of entire organism

Science that deals with structures and functions of the cell

observed bacteria in various body fluids, water and pepper infusions

concluded that all organisms are composed of cells and cell parts;

this conclusion gave rise to the Cell theory

the presence of cube-like spaces in corks and other plant structures and named them “cells”

observed bacteria in various body fluids

Cell theory

discovered the presence of cube

Tube-like

Spherical

tail-like