Question
What is a universal indicator? For what purpose is it used?
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| Body cavity | Germ Layer | Phylum |
| Absent | _____________ | Porifera |
| Absent | Triploblastic | _____________ |
| Pseudocoelom | _____________ | Aschelminthes |
| Present | _____________ | Arthropoda |
| Subphylum/Class | Characteristics |
| (1) Cyclostomata | (a) Collar cells |
| (2) Urochordat | (b) Sucker |
| (c) Tunic | |
| (d) Chitinous exoskeleton |