Question

phylum annelida

leeches, like the ones shown above, make up this class of annelids. they produce hirudin, which is an anti - clotting substance often used for medicinal uses. they are mostly free living carnivores.

what are the features of the class polychaeta?

contains leeches, some have medicinal uses, mostly are free - living carnivores

mostly earthworms, repeated body segments, closed circulatory system

paddle - like appendages, can live in tubes, live in marine or aquatic habitats

Explanation:

1. Analyze Option 1: The description "contains leeches, some have medicinal uses, mostly are free - living carnivores" is for Class Hirudinea (leeches), not Polychaeta.
2. Analyze Option 2: "mostly earthworms, repeated body segments, closed circulatory system" is characteristic of Class Oligochaeta (earthworms), not Polychaeta.
3. Analyze Option 3: Class Polychaeta has features like paddle - like appendages (parapodia), many species can live in tubes, and they are mainly found in marine or aquatic habitats. So this option correctly describes Class Polychaeta.

Answer:

C. paddle - like appendages, can live in tubes, live in marine or aquatic habitats