ALL PROTISTS ARE UNICELLULAR AND MICROSCOPIC IN NATURE, is the correct answer.
Protists are diverse collection of organisms which are primarily microscopic and unicellular in nature. Protists are scientifically categorized as eukaryotes and one definition of protists states that prosists are all eukaryotes organisms that are not animal, plant or fungi.
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True is the answer for the mean distance of the sun
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A substrate is a molecule upon which an enzyme acts. The substrate is changed by the reaction and, in this case, two products are made. A reactant and substrate have the same meaning. The term reactant is more often used in chemistry. Biology Science
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