Mots Croisés INVERTEBRATESVersion en ligne Look invertebrate animals. par Luisa Fernanda Acevedo Serna 1 External skeleton. 2 This group includes: anemones, corals and jellyfish. 3 They have an exoskeleton. 4 No muscles nerves or organs. 5 Have a foot or tentacles. 6 They have adapted to nearly every ecosystem. 6 4 2 3 5