AP BIOLOGY

Detailed explanation-1: -Annelids include segmented worms, such as leeches and earthworms; they are the most advanced worms as they possess a true coelom.

Detailed explanation-2: -Earthworms and leeches both belong to a group of invertebrates called annelids. These are soft worms whose bodies are split into parts, called segments. Each segment has its own set of organs.

Detailed explanation-3: -An earthworm is a terrestrial invertebrate that belongs to the phylum Annelida. They exhibit a tube-within-a-tube body plan; they are externally segmented with corresponding internal segmentation; and they usually have setae on all segments.

Detailed explanation-4: -Leeches are segmented parasitic or predatory worms that comprise the subclass Hirudinea within the phylum Annelida.

Detailed explanation-5: -Earthworms belong to phylum annelida. This phylum is part of the animal kingdom and includes marine, freshwater and terrestrial worms in addition to leeches.