Which group of animals has a body wall composed of both circular and longitudinal muscle fibres surrounded by a moist, cellular cuticle that is secreted by an epidermal epithelium?

Annelida

The correct answer is Option (2) - Annelida

The group of animals with a body wall composed of both circular and longitudinal muscle fibers surrounded by a moist, cellular cuticle secreted by an epidermal epithelium is Annelida.

Annelida:

• Annelids are segmented worms, and their body wall consists of circular and longitudinal muscle fibers.
• The moist, cellular cuticle provides protection and helps in maintaining moisture.
• The epidermal epithelium secretes the cuticle, and the segmentation is a distinctive feature of this group.

This body plan is well-suited for the burrowing and crawling lifestyle of annelids. Examples of annelids include earthworms and leeches.