The changes in the grape juice happened due to the alcoholic fermentation of the grape juice that occurs due to the presence of aerobic bacteria. The presence of yeast is the main reason behind the process of fermentation taking place. The froth is produced due to the presence of the formation of acid and carbon dioxide.
What happens to the population density and competition if the birth rate decreases?
The birth rate would increase is the population density competition increased.
Hope I helped.
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Being original , it’s not really creative
