AP BIOLOGY

Detailed explanation-1: -The first part states that all organisms are made of cells. The second part states that cells are the basic units of life. These parts were based on a conclusion made by Schwann and Matthias Schleiden in 1838, after comparing their observations of plant and animal cells.

Detailed explanation-2: -Theodor Schwann, (born December 7, 1810, Neuss, Prussia [Germany]-died January 11, 1882, Cologne, Germany), German physiologist who founded modern histology by defining the cell as the basic unit of animal structure.

Detailed explanation-3: -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-4: -The zoologist who concluded that animal tissues are made of cells Theodor Schwann . Anton Van Leeuwenhoeck. The botanist who concluded that plant tissues are made of cells Mathias Schleiden. The scientist who described and first named the “cell” Robert Hooke .

Detailed explanation-5: -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. Schleiden and Schwann articulated their observations as a unified theory-the cell theory-in 1839.