Hypothesis variable for involves Biology

Hypothesis is simply a tentative 

A hypothesis is simply a tentative, unproven explanation for something that has been observed. It may not be the correct explanation—testing will determine whether it is correct or incorrect. To be accepted by scientists, the results of any experiments designed to test the hypothesis must be repeatable and capable of being duplicated by others.

The nature of the testing will vary according to the circumstances and materials, but good experiments are run in two forms, the second form being called a control. In the first form, a specific aspect, or variable, is changed. The control is run in precisely the same way but without changing the specific aspect, or variable. The scientist then can be sure that any differences in the results of the parallel experiments are due to the change in the variable hypothesis.
The nature of the testing will vary according to the circumstances and materials, but good experiments are run in two forms, the second form being called a control. In the first form, a specific aspect, or variable, is changed. The control is run in precisely the same way but without changing the specific aspect, or variable. The scientist then can be sure that any differences in the results of the parallel experiments are due to the change in the variable hypothesis.

We may test the hypothesis 

For example, we may observe that a ripe orange we have eaten tastes sweet. We may then make the hypothesis variable that all ripe citrus fruits taste sweet. We may test the hypothesis by tasting oranges and other citrus fruits such as tangerines and lemons. As a result of our testing (since lemons taste sour), we may modify the hypothesis to state that only some ripe citrus fruits are sweet. In such an experiment, the variable involves more than one kind of ripe citrus fruit variable; the control variable, on the other hand, involves only ripe oranges.

When a hypothesis is tested 

When a hypothesis is tested, data (bits of information) are accumulated and may lead to the formulation of a useful generalization called a principle. Several related principles may lend themselves to grouping into a theory, which is not simply a guess. A theory is a group of generalizations (principles) that help us understand something. We reject or modify theories only when new principles increase our understanding of a phenomenon.

Microscopes

The microscope is an indispensable tool of most botanists, and biologists in general. This instrument traces its origin to 1590 when a family of Dutch spectacle makers found they could magnify tiny objects more than 30 times when they combined two convex lenses in a tube; they also found they could make minute objects visible with the magnification their instrument achieved. A few decades later, a Dutch draper—Anton van Leeuwenhoek (1632–1723)—ground lenses and eventually made 400 microscopes by hand, some of which could magnify up to 200 times. Modern microscopes, can produce magnifications of more than 200,000 times and are leading almost daily to new discoveries in biology.

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