Which of the following sentences is grammatically correct? a. he couldn't find his baseball glove, it was under a pile of clothes. b. he couldn't find his baseball glove it was under a pile of clothes. c. he couldn't find his baseball glove and it was under a pile of clothes. d. he couldn't find his baseball glove; it was under a pile of clothes.

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.