When you see an organism that you’ve never seen before, you probably automatically classify it into a specific group. If it’s green and leafy, you would probably call it a plant.
If it’s long and slithers, you would probably classify it as a snake. How do you make such assignments? You look at the physical features of the organism and think about what it has in common with other organisms.
Scientists do the same thing when they classify living things. But scientists classify organisms not only by their physical features, but also by their evolutionary history and relatedness.
Lions and tigers look like each other more than they look like bears. But it’s not just appearance. The two cats are actually more closely related to each other than to bears. How related organisms are is an important basis for classifying them.
In Chapter 18, students will
Explain what makes up a scientific name.
Explain what defines a species.
List the information scientists use to classify organisms.List the three domains of life and the chief characteristics of each.
Read Biology text pg 446-467 or Digital Book p51-58.
Lessons