Question

which part of hemichordates helps in burrowing? ​

Answer 1

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Explanation:

Hemichordate is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and Pterobranchia. A third class, Planctosphaeroidea, is known only from the larva of a single species, Planctosphaera pelagica. The extinct class Graptolithina is closely related to the pterobranchs.[1]

Answer 2

Hemichordate is a "phylum of marine deuterostome animals", usually considered  to be the "sister group of the echinoderms".

Explanation:

• They mostly arrived in the Lower or the Middle Cambrian and added to the two important classes.
• They are Enteropneusta (acorn worms), and Pterobranchia.
• A 3rd class known as Planctosphaeroidea which is called only from the "larva of a single species", Planctosphaera pelagica.
• The "inactive class Graptolithina" is closely associated to the pterobranchs.

To know more:

Discuss the affinities, ancestry and evolution of hemichordates and protochordates.

https://brainly.in/question/8291397