( A ) Cockroach — 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
( B ) Earthworm — The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
( C ) Rat — Left kidney is slightly higher in position than the right one
( D ) Frog — Body divisible into three regions-head, neck and trunk
