If an experiment is not verifiable, the person doing the experiment would never be able to get the answer to their hypothesis. Hypotheses need to be testable.
Hope that clarified things.
The organisms who do better at surviving and reproducing will pass on more genes than those who don't. So those with better adaptations will survive more to pass on those genes.
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Cancer develops when the body's normal control mechanism stops working. Old cells do not die and instead grow out of control, forming new, abnormal cells. These extra cells may form a mass of tissue, called a tumor. Some cancers, such as leukemia, do not form tumors.
Explanation: