A 2. Which of the following are features that help scientists classify annelids into their respective classes? O presence of setae and tentacles presence of setae and parapodia presence of setae and septa presence of coelom and parapodia

presence of setae and parapodia

Explanation:

Annelids are groups of organisms under the phylum "Annelida". They are organisms that possess the following characteristics or features: setae, parapodia, coelom, tentacles etc. However, via the possession of not of the setae and parapodia, annelids have been classified into four major classes viz: Polychaeta, Oligochaeta, Hiradinea and Archiannelida, on the basis of their setae and parapodia mainly.

- Polychaeta: possess numerous setae and parapodia

- Oligochaeta: few setae, no parapodia

- Hiradinea: No setae, no parapodia

- Archiannelida: No setae, no parapodia

Hence, the presence of setae and parapodia will enable the scientists classify annelids into their respective classes.