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Microscopes & research.

Anton von Leeuwenhoek develops a more powerful microscope that allows him to see living cells like bacteria. Matthias Schleiden and Theodor Schwann conclude that all living organisms are made of cells, and that cells can be produced from other cells.

A cell can be described as the structural and functional unit of life. It can also be described as the building material of all living organisms.

Without the cell, most living organisms will not be able to function. An organelle will not be able to survive that long within its life span without the presence of cells. It will just withe and die off.

Lots of scientists have proved in various ways the existence of cells, this is because they have been able to create microscopes that can see these tiny cells. This is evidence that proves the existence of cells.

Please see the link below for more information;

https://brainly.com/question/16247044?referrer=searchResults