The human body uses specialized biomolecules to speed up chemical reactions. These are called enzymes. Without enzymes, the reaction in the body would happen too slowly to keep you alive. Which biomolecule do enzymes belong to?
A. Proteins
B. Lipids
C. Nucleic acids
D. Carbohydrates

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

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