Hie my friend,
Hypothesis, is just an Assumption made by the scientists on the- observations,experiments they record., hypothesis is a thinking is an assumption,on a scientific statement about future  event .. that Scientists think about the phenomena happening around that why. when and so on when a person thinks like that than he is making an hypothesis or an hypothetical statement...
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A useful hypothesis is a testable statement which may include a prediction.For example, the study of bio-diversity usually involves looking at wide variety of specimens and maybe sketching and recording their unique characteristics. However, there are other times when we science teachers are trying to teach students how scientists work and how we can verify things which others may say or believe is so without any proof.
Chocolate may cause pimples.Salt in soil may affect plant growth.Plant growth may be affected by the color of the light.Bacterial growth may be affected by temperature.Ultra violet light may cause skin cancer.Temperature may cause leaves to change color.are the examples hypotheses because they use tenative word may.