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Theory
The "cell theory" is a unifying concept in biology. The cell theory states: 1. All organisms consists of one or more cells 2. The cell is the basic unit of structure for all organisms 3. All cells arise only from preexisting cells This theory bridges the gap between the old belief of "spontaneous generation" and the modern view of cells and the origins of life. It is because of this theory that modern biological advances have been possible.
The theory of evolution by natural selection.
It is a scientific theory
In science, a hypothesis and a theory differs in that a hypothesis is a conjecture based on empirical observation or theoretical derivation yet unproven or by any experimental work, and that a theory is a hypothesis that has been rigorously tested by many researchers and supported by strong evidence. Evolution is a theory that has been repeatedly tested, supported by overwhelming evidence, and can be used to explain natural phenomenon very well.