Body organs are made of several kinds of tissue. A group of organs work together to form a system. Most living things are called organisms. Organism sounds like the word organ. An organism is a living thing.
Many organisms have organs and systems.
We will examine how organisms begin to interact with their environment. Each living thing or organism has been classified into a genus and species. The genus and species are the two smallest divisions of living things. Classification helps show if living things are closely related. The more similar two living things are, the more groups they share.