Wich detail from the excerpt best indicate that one of the author's purpose in writing it's our world

The balance includes both the fees for service and the shipping charges. is this sentence incomplete or complete?

Laura is writing a report about the natural resources of mississippi. she will collect information about the natural resources from many different sources. one will be a multimedia encyclopedia. when she searches for information in a multimedia encyclopedia, she finds four results. three of the results will laura, but one will not her. which of these articles will not laura write her report? a) "the oil of mississippi" b) "the timber of mississippi" c) "the politics of mississippi" d) "the natural gas of mississippi"

Dogs make wonderful pets because they us stay happy and healthy. the topic sentence is "dogs make wonderful pets." , is this correct? i keep doubting myself.