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What is a hypothesis? (plural: hypotheses) I'll take Science Experiment terms for $1,000, Alex.
Scientific theory is a well substantiated explanation of something to do with the natural world. This is based on and confirmed by doing observation and experiments repeatedly.
Darwin observed that high birthrates and a shortage of life's necessities forced organisms into a constant "struggle for existence", both against the environment and against each other is which led Darwin to propose his theory of constitution
Zacharias Jansen (c. 1580 - c. 1638) was a Dutch spectacle-maker credited with inventing the first microscope. By the end of the seventeenth century, further developments by Anton van Leeuwenhoek and Robert Hooke allowed Jansenâ??s microscope to be expanded on and this led to the observation of cells under a microscope.
It showed that fixed air is carbon dioxide.
They don't! Abiogenisis is not part of evolution as you need already living organisms to evolve. This is a common creationist misunderstanding of evolution and evolutionary theory
a theory which is made by observation
They never heard of this theory.
If new observations are discovered that clash with the previous theory, then the theory will have to be revised.
An hypothesis is a theory based on observation and the knowledge of the topic.
observation proved the theory true.