Identify the phylum of kingdom Animalia in which the animal has:
$(a)$ $A$ pseudocoelom
$(b)$ $A$ water-driven tube system
$(c)$ Jointed legs
$(d)$ Pores in the body leading to a canal system
$(e)$ Notochord at some stages of their life.

(N/A) Nematoda: These organisms possess a pseudocoelom,which is a body cavity not completely lined by mesoderm.
$(b)$ Echinodermata: These animals possess a unique water vascular system (water-driven tube system) which helps in locomotion,capture,and transport of food and respiration.
$(c)$ Arthropoda: This phylum is characterized by the presence of jointed appendages (jointed legs).
$(d)$ Porifera: These are pore-bearing animals where the body wall contains numerous ostia (pores) leading to a water canal system for circulation.
$(e)$ Chordata (specifically Protochordata): These animals possess a notochord at some stage of their life cycle.