- Notochord
- Vertebral column
- Pharyngeal slits
- Post-anal tail
Category: DIVERSITY AMONG ANTMALS (THE KTNGDOM ANIMALIA)
- The division of the body into repeated units
- The formation of germ layers
- The development of specialized organs
- The process of cell division
- Annelida
- Mollusca
- Arthropoda
- Nematoda
- Annelida
- Mollusca
- Arthropoda
- Echinodermata
- Radial symmetry
- Stinging cells (cnidocytes)
- Tentacles
- A gastrovascular cavity
- Ostrich
- Emu
- Condor
- Albatross
- Heterotrophic
- Multicellular
- Cell walls made of chitin
- Motility at some life stage
- Alligators and crocodiles
- Lizards and snakes
- Turtles and tortoises
- Tuataras
- Ganoid scales
- Cycloid scales
- Ctenoid scales
- Placoid scales
- Asteroidea
- Ophiuroidea
- Echinoidea
- Holothuroidea
- Cephalopoda
- Bivalvia
- Polyplacophora (Chitons)
- Gastropoda
- Flatworms
- Segmented worms
- Roundworms
- Comb jellies
- Support
- Protection
- Attachment for muscles
- All of the above
- Digestion and circulation
- Respiration and excretion
- Reproduction and locomotion
- Sensing and defense
- Pinacocytes
- Amoebocytes
- Choanocytes
- Porocytes
- Sternum
- Keel
- Furcula
- Pygostyle
- Marsupials
- Monotremes
- Placentals
- All of the above
