Identify the DID WHAT in the following sentences. Astronomers have recently announced the discovery of additional planets within our solar system. These planets are located within a zone of the solar systems that would allow liquid water to form. Could there be life on these planets? Scientists are investigating this question by using NASA's Kepler telescope. astronomers discovered additional planets Could there be life on these planets? astronomers are using NASA's Kepler telescope

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were 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.