to consider something alive (at least what i was taught) the organism has to replicate in the order DNA to RNA to Protein, cells are the smallest units that have this ability.
virus have a different cycle typiclly going: modified RNA to DNA to RNA to Protein which is why they arent considered (yet) to being alive
That all animals are composed of cells
He had concluded that all animals also have cells.
Schwann cells and oligodendrocytes
Schwann cells are glia that myelinate the neurons of the Peripheral Nervous System
His conclusion was that all animals have cells.
Cell Theory..
all animals are composed of cells
That all animals are composed of cells
that all animals were made of cells
All living things are made of one or more cells.
Schleiden and Schwann came up with what is known as "The Theory of Cells" or "Cell Theory." The main principles of "Cell Theory" are:All cells come from cellsA cell is the basic unit of lifeAll organisms are made of cells
Cells are the basic unit structure and function of all living thing's+
Theodore Schwann did not conclude all plants are made of cells. He concluded that all animals were made up of cells. However, Matthais Schlieden did conclude that all plants were made of cells. He concluded this in 1838.
He had concluded that all animals also have cells.
Schwann cells and oligodendrocytes
This questions has been answered below in the related discussions, "what are Schwann cells"
Schwann cells are glia that myelinate the neurons of the Peripheral Nervous System