Biosphere. Bio means life, and Biosphere means ALL life on earth.
Answer: absolute certainty is often difficult to achieve. Scientific uncertainty generally means that there is a range of possible values within which the true value of the measurement lies.
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It’s an Element. Because each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.
yeast uses glycolysis and alcohol fermentation to break down sugars in dough then it releases alcohol and carbon dioxide as waste and the carbon dioxide gas causes the bread to rise