What three things did scientist discover about living things and cells?

The three parts of the cell theory are as follows:
(1) All living things are made up of cells,
(2) Cells are the smallest units (or most basic building blocks) of life, and
(3) All cells come from preexisting cells through the process of cell division.

Cells were first seen and or observed by the natural philosopher Robert Hooke in the year 1665.

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In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.