You enjoy being around people who challenge you intellectually.

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When you make friends, you crack a joke, if you're feeling insecure, you make fun of yourself before anyone else does, and when your date is laughing non-stop, you feel like you've made a good impression. You tend to be quiet and sometimes get embarrassed easily.

You keep pretty much to yourself, and mostly open-up to those who are really, really close to you - your family and best friends - which also means you're really trustworthy and loyal.

You're really smart, obviously, but you're more book smart than street smart.

You like reading, watch the news, and love discussing whatever is going on in the world.

These characteristics help us to declare that, for example, sea anemones are animals, not plants (even though sea anemones superficially resemble flowers).

To begin our exploration of animal characteristics, I've listed the basic characteristics shared by most (or, in many cases, all) animals.

Then, in the sections that follow, you can find additional information about each of these characteristics and how they help to define what, exactly, an animal is.

You tend to have lots of crushes (celebrities, friends, neighbors, you name it!

It's a simple enough question, but the answer requires an understanding of some of the more obscure characteristics of organisms—characteristics such as multicellularity, heterotrophy, diploidy, and eukaryotic cells.