AP BIOLOGY

Detailed explanation-1: -In 1838, German scientist Matthias Schleiden concluded that all plants are made of cells.

Detailed explanation-2: -German scientists Theodore Schwann and Mattias Schleiden studied cells of animals and plants respectively. These scientists identified key differences between the two cell types and put forth the idea that cells were the fundamental units of both plants and animals.

Detailed explanation-3: -Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.

Detailed explanation-4: -By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.

Detailed explanation-5: -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.