AP BIOLOGY

Detailed explanation-1: -The Cell Theory was first given by M.J Schleiden and Theodor Schwann in 1839. It states that all the living beings whether plants or animals are composed of cells that are from pre-existing cells. However, they failed to explain how new cells are formed.

Detailed explanation-2: -Credit for developing cell theory is usually given to three scientists: Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839, Schwann and Schleiden suggested that cells were the basic unit of life. Their theory accepted the first two tenets of modern cell theory (see next section, below).

Detailed explanation-3: -While looking at cork, Hooke observed box-shaped structures, which he called “cells” as they reminded him of the cells, or rooms, in monasteries. This discovery led to the development of the classical cell theory. The classical cell theory was proposed by Theodor Schwann in 1839.

Detailed explanation-4: -The generally accepted portions of the modern Cell Theory are as follows: The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells. Cells arise from other cells through cellular division.

Detailed explanation-5: -The ideas of all three scientists-Schwann, Schleiden, and Virchow-led to cell theory, which is one of the fundamental theories unifying all of biology.