Name the phylum to which the following organisms belong:
$(a)$ Organisms which have a peculiar water-driven tube system that they use for moving around.
$(b)$ Organisms which have a foot that is used for moving around and have an open circulatory system.
$(c)$ These organisms have holes or pores all over the body. These lead to a canal system that helps in circulating water throughout the body.

(N/A) The phylum is Echinodermata. These organisms possess a unique water vascular system (water-driven tube system) which is used for locomotion,capture and transport of food,and respiration.
$(b)$ The phylum is Mollusca. These organisms typically have a muscular foot used for locomotion and an open circulatory system (except for cephalopods).
$(c)$ The phylum is Porifera. These organisms are characterized by the presence of numerous pores (ostia) on their body,which lead to a canal system that facilitates water circulation for nutrition and gas exchange.