Which of the following animal is included in protostome?

Explanation

Annelids, Molluscs, and arthropods fall into the category of protostomes. Sea mice belong to the phylum annelida, therefore they are protostomes.Sea lions, and sea horses are chordates, whereas sea cucumbers are echinoderms.Protostomes are organisms in which blastopore develops into the mouth. These include phylums Annelida, Arthropoda, Mollusca.Deuterostomes are organisms in which blastopore develops into anus first and later into mouth. These include phylums Echinodermata, Hemichordate, Chordata.