Which prefix would appear in the iupac name for a covalent compound that has four atoms of a single element?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Pls ill give u brainliest which of the following is true about science? 1. political conditions are unable to influence it. 2. economic concerns may prevent it from solving problems.