What is common among bed bugs,leeches,and mosquitoes?

Which of the following is correctly matched?

$A.$ Animals are multicellular organisms composed of eukaryotic cells.
$R.$ Sponges do not perform photosynthesis and obtain nutrition by absorption.

Which one feature is common to leech,cockroach and scorpion?

Distinguish the characteristics for Chondrichthyes (Cartilaginous fishes) and Osteichthyes (Bony fishes) from the following list:
$I$ - Air bladder absent,$II$ - Operculum absent,$III$ - Cycloid or ctenoid scales,$IV$ - Placoid scales,$V$ - Ventral mouth,$VI$ - Terminal mouth,$VII$ - Internal fertilization,$VIII$ - External fertilization.
Select the correct grouping for Chondrichthyes and Osteichthyes respectively.

In which of the following do the organisms of the Kingdom Animalia show great diversity?