Answer:
Bacteria and fungi are actually decomposers. They eat decaying matter - dead plants and animals and in the process they break them down and decompose them.
There are different types of observers. Casual observers differ from scientific observer. Seeing and observing are two different things. Not that everybody seeing is actually observing the thing.
A casual observer just sits back and watch for something to happen while a scientific observer comes up with some hypothesis to work on it.
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He took swabs of one pea plant and put it on others to help them reproduce.