Question

could you give two features why should we keep earthworm in the phylum annelida

Answer 1

Each segment on an earthworm’s body has a number of bristly hairs, called setae (sometimes written as chaetae). These hairs provide some grip to help the earthworm move through the soil.An earthworm has a streamlined body with no antennae or fins or arms or legs! This streamlined shape is an adaptation to living in narrow burrows underground and the need to move easily through the soil.

Answer 2

 earthworm  has features like: 1. the earthworm is bilaterally and segmented
2.  respiration takes place the general body surface

 And in the phylum annelida these features are there