How can volcanoes be beneficial? A. The lava breaks down into fertile soil over time.
B. The ash clears out harmful bugs like mosquitoes long after the volcano has
erupted.
C. They provide a nesting ground for certain bird species that need extremely
hot temperatures to hatch their eggs.
D. Sulfur dioxide binds to pollutants and pulls them out of the air as the ash
falls.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.