Scientists believe that of species that once existed on earth are now extinct.

Scientist believe that 1/3 of species that once existed on Earth are now extinct

The answer is 1/3

Explanation: There is no explanation it is a simple fact.

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answer; atp and nadph;

lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !