? 1. las sustancias puras son compuestos químicos. 2. las sustancias simples son sustancias puras. 3. una disolución es una mezcla heterogénea de dos componentes: el disolvente y el soluto. 4. los coloides son mezclas homogéneas de aspecto heterogéneo.

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.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.