Which one of the following is a living fossil?

Which of the following organisms exhibit radial symmetry?

Match the following columns correctly and select the appropriate option:

Column $A$	Column $B$	Column $C$
$(1)$ Planaria	$(a)$ Planula	$(e)$ Ostia
$(2)$ Hyalonema	$(b)$ Pseudocoelomate	$(f)$ Flame cells
$(3)$ Hydra	$(c)$ Platyhelminthes	$(g)$ Polyp
$(4)$ Wuchereria	$(d)$ Porifera	$(h)$ Aschelminthes

The adult stage of a housefly or mosquito is known as:

Which is the correct match based on the characteristics of animals?

Column-$I$	Column-$II$ (Phylum)	Column-$III$ (Example)
$I$. Water canal system	$a$. Porifera	$p$. Sea lily
$II$. Proboscis	$b$. Hemichordata	$q$. Sepia
$III$. Water vascular system	$c$. Mollusca	$r$. Sycon
$IV$. Shell	$d$. Echinodermata	$s$. Balanoglossus

Select the incorrect statements from the following:
$A$. Digestive system in Platyhelminthes is incomplete.
$B$. Bilateral symmetry is a characteristic feature of adult Echinoderms.
$C$. Pseudocoelom is possessed by Aschelminthes.
$D$. Notochord is persistent throughout life in the class Chondrichthyes.
$E$. Members of class Reptilia maintain a constant body temperature.