In your experiment, you created two separate systems: cellular respiration in part 1, and photosynthesis in part 2. Explain whether these two separate systems are a good representation of the way cellular respiration and photosynthesis work in the natural world. Can living things survive in a system involving only cellular respiration or only photosynthesis? If not, how could you use similar materials to set up a new experiment that would better model the real world?

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

amber has allowed scientists to study dna that has been preserved over millions of years.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.