What are the following features and in what taxa can you find them? 1. Spicules…

What are the following features and in what taxa can you find them?
1. Spicules: what are they?
2. Spicules: what taxon?
3. Nephridia: what are they?
4. Nephridia: what taxon?
5. Notochord: what is it?
6. Notochord: what taxon?
7. Hemocoel: what is it?
8. Hemocoel: what taxon?
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1. Spicules: what are they?
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