1. During the reproductive seasons the differentiated adult polychaetes are called _____.
2. Diplosegment is the major distinguishing feature in ____?
3. First preoral appendages of arachnida is ?
4. Heterogony in rotifers is the ___
5. Mollusca is represented in the terrestrial environment by ____?
6. Osphridia in molluscs is used for ____?
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