Freshman Biology HELP PLEASE !!

Which of the following terms describe a liquid molecule that has only single bonds between its carbon atoms

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Match with o for organic and i for inorganic for each compound