Which one of the following is not correctly matched?

Which of the following animals is hermaphrodite (bisexual)?

Which of the following is $NOT$ an endoparasite?

Provide the appropriate technical term for the following descriptions:
$(a)$ Blood-filled cavity in arthropods.
$(b)$ Free-floating form of cnidaria.
$(c)$ Stinging organ of jellyfish.
$(d)$ Lateral appendages in aquatic annelids.

Select the correct match for Column $X$, Column $Y$, and Column $Z$:

Column $X$	Column $Y$	Column $Z$
$(1)$ Water vascular system	$(A)$ Porifera	$(p)$ Starfish
$(2)$ Proboscis	$(B)$ Hemichordata	$(q)$ Sepia
$(3)$ Canal system	$(C)$ Mollusca	$(r)$ Hyalonema
$(4)$ Shell	$(D)$ Echinodermata	$(s)$ Balanoglossus

The branch of science dealing with the study of birds is