Why are fossil fuels used so much today?

Which pronoun has an unclear antecedent in the following sentences? the sixth-grade students liked volunteering their time to read to the elderly people in the hospital. it made them happy. a. their b. it c. them d. no unclear antecedents

Give reason why some traditional caribbean customs are presently changing

Rank the following from most to least devasting: ordovician,permaian,cretaceous, pleistocene