For the following experiment, write a possible hypothesis, and then identify the independent variable, dependent variable, and controlled variables. john wants to know what type of liquid plants grow taller. he collects samples of water, coffee, and soda, and he finds three sunflower plants that are the same height.

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.