During 1839, Schlieden and Schwan jointly proposed which of the following theories?

✏️In 1839, Matthias Jakob Schleiden, a botanist, and Theodor Schwann, a zoologist, independently came to the same conclusion and jointly proposed the cell theory. It consisted of three basic tenets:
-All living organisms are composed of cells.
-The cell is the basic unit of life.
-New cells arise only from existing cells.

0ther options explanations:
-Theory of evolution: This theory, proposed by Charles Darwin in 1859, explains how populations of organisms change over time through natural selection.
-Theory of purelines: This theory, developed by Wilhelm Johannsen in 1903, argues that specific hereditary traits are controlled by individual "genes" located in chromosomes.
-Cell-lineage theory: This theory, proposed by Rudolf Virchow in 1855, states that all cells come from pre-existing cells and emphasizes the continuity of life through cell division.