parts of the body and how they fit and work together...
http://en.wikipedia.org/wiki/AnatomyUnder a microscope, a drop of water collected from moss or leaves on the forest floor might look like an alien world. You might think, “how can I find a tardigrade in this soup of floating, spinning, and wriggling critters?” Luckily, tardigrades are one-of-a-kind. If you can spot a few important features, you can find your own tardigrades too!
Imagine being the size of an ant. Be careful - a face-to-face encounter with an ant would be scary and potentially life-threatening! But, if you avoided being eaten, you could learn a lot about ant anatomy from a close-up view. Ants have many body parts that are normally hard to see without a magnifying glass or microscope. And each structure has its own special function.
