Silicon being carbon's "family member" opens up a lot of questions about its role in the world, given carbon's prevalence and importance. What are your thoughts on the likelihood of non- carbon-based life forms

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

This is a solution, hope i could

The correct answer to this question is 28 

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).