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![]() edHelper.com Animal Themes Invertebrates |
Invertebrates |
| edHelper's suggested reading level: | grades 4 to 8 | |
| Flesch-Kincaid grade level: | 9.42 |
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| Invertebrates |
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1 With over 2 million known animal species on Earth, 98% of them are invertebrates. Invertebrates are animals that don't have backbones. They live in a variety of environments, from hot and unbearable deserts to frigid and equally unbearable polar regions. They also come in an assortment of shapes and colors. To better understand invertebrates, scientists group them into eight major categories. Here are the categories and a fact or two about each category: