Molds are a type of fungus with a multicellular growth (opposite of yeasts) and tend to grow in hot and warm but also humid environment.
Explanation:
A hypothesis is an idea of what is causing a problem or the what the origins of the problems are.
In this case, a possible hypothesis is that the "molded" side of the bread is having a different exposure to the external environment, such as hot/warm but humid/<em>wet-ish</em> conditions.
A scientific hypothesis is an educated guess or statement based on the pre-knowledge which could be proved or disproved through experiments in the scientific method.
In the given conditions, the scientific hypothesis based on the observations will be<em> "In certain conditions, the molds grow more on one side of the slice of bread than on the other side"</em> which explains the pattern of growth of molds in the experiment which could be tested and proved on the basis of experiments.
