What u guys think of this?

What percentage of the earth's water is available for use by living things?

Ben is interested in using a source that provides original research, current and developing trends and experts within specific fields. which source should he use?

All of these sentences include commonly confused homophones. which sentence is correct? you put too much sugar on your breakfast serial. my father grows vegetables and flours in his garden. will someone me untie the knot in my shoelace? when did the captain set sale on his trip to north america?