3.

1 answer:

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The united cell idea was put forth by zoologist Theodor Schwann and botanist Matthias Schleiden in the late 1830s while they were researching tissues.

According to the unified cell theory, each living entity is made up of one or more cells, each cell is the building block of life, and new cells develop from existing cells.
Schleiden and Schwann advocated spontaneous generation (also known as abiogenesis) as the mechanism for cell origination, but spontaneous generation was later demonstrated to be false. The famous phrase "Omnis cellula e cellula" by Rudolf Virchow "Only pre-existing cells can give rise to new ones." However, the portions of the hypothesis unrelated to how cells first formed withstood scientific investigation and are currently accepted by the majority of scientists.
The following are the elements of contemporary cell theory that are commonly acknowledged:

The basic unit of structure and function in living things is the cell.
One or more cells make up every living thing.
Through cellular division, new cells are created from existing ones.

Therefore, Schwann's and Schleiden's gave unified cell theory.

Learn more about cell theory:

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