What do scientists usually do when a scientific problem first arises?

Scientists usually raise a hypothesis based on their knowledge and previous observations. This hypothesis will be tested by an experiment.

This hypothesis arises from the research question posed by the researchers.This initial hypothesis is also called null hypothesis and will be accompanied by alternate hypotheses

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photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.