2. Water is an excellent solvent. With water being a polar molecule, it can be an especially strong solvent for other
polar molecules. Give an example of how water acting as a
solvent is important for living organisms.
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Water acts as a solvent of carbon dioxide excreted from tissues, in blood and helps in regulating pH (because it forms carbonic acid that lowers pH when it tends to get higher). Blood pH should be maintained at about 7.4. One major reason is that the structure of protein is dependent ton pH because pH determines its ionization hence also affecting the charges and interaction between side groups of amino acids. A change in pH may, therefore, denature proteins and negatively affect cellular functions.

Explanation:

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it's c. elements are placed in rows based on how may valencies electrons have.