In the same way, if you turn to the structure of any animal, you will find that it is composed of parts or organs made up of different kinds of tissues, and these tissues examined under a microscope will disclose a cellular structure similar to that exhibited by the plant.
“Look where you will among living things, plant or animal, you will find
that all are mere assemblages of cellular tissues.”
Extend your investigation further, and examine into forms of life so minute that they can be seen only with the most powerful microscope and you will come upon a “whole universe of tiny creatures consisting of a single cell”.
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