Haemocoel is found in

Which of the following represents the correct combination without any exception?

$Option$	$Characteristics$
$(a)$	$Cyclostomata$: Sucking and circular mouth; jaws absent, integument without scales; paired appendages.
$(b)$	$Aves$: Body covered with feathers; skin moist and glandular, fore-limbs form wings; lungs with air sacs.
$(c)$	$Mammalia$: Mammary gland; hair on body; pinnae; two pairs of limbs.
$(d)$	$Chondrichthyes$: Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord.

Which of the following statements is false?

Which of the following statements are true or false?
$(i)$ Suckers are found in liver fluke.
$(ii)$ In Arthropods,fertilization is external.
$(iii)$ Chordata is divided into $4$ subphyla.
$(iv)$ Water vascular system is present in Hemichordata.

Which one of the following phyla is correctly matched with its two general characteristics?

$Monocystis$ belongs to the order: