How many of the following organisms belong to the second-largest phylum?
Apple snail, Pearl, oyster, Anopheles, Culex, Aedes, Starfish, Sea urchin, Cuttlefish, Sea cucumber, Squid, Devil fish

From the following list of invertebrates, how many of them are included in the largest marine phylum of animal kingdom ? Star, fish ,sea, urchin , Cuttle fish , Apple snail, Pearl oyster , Anopheles , Culex , Aedes , sea , cucumber , squid , Devil fish

How many organism are releated with Echinodermata phylum Star fish, Sea-urchin, Sea-lily, Sea-mouse, Sea-hare, Sea-cucumber, Brittle star, Sea-potato, Sea-squirt, Sea-fan, Sea-pen

Which of the following are most intelligent invertebrates. 1. Crustaceans such as cray fish and hermit crab 2. Arachnidians like scorpions and spiders 3. Cephalopods such as squids and octopus 4. Echinoderms like starfish and sea urchin