Mrs. Cortez has asked her students to write an explanation what chromosomes are and what they do. Four student examples are shown. Which student has written the best explanation of chromosomes?

Environmental differences within ecosystems are generally caused by

Which process of living things produces water that enters the water cycle

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit