| A | B |
|---|
| animal | a multicellular heterotroph |
| organ | a group of tissues that work together |
| tissue | a group of cells that work together |
| sexual reproduction | the process by which a new organism forms from the joining of a sperm and an egg |
| vertebrate | an animal with a backbone |
| invertebrate | animals without a backbone |
| carnivore | an animal that eats meat |
| predator | an animal that hunts and kills other animals for food |
| bilateral symmetry | symmetry with only one line of division |
| radial symmetry | symmetry with multiple lines of division |
| Porifera | the phylum of sponges |
| Cnidaria | the phylum of animals with stinging cells and radial symmetry |
| omnivores | animals that eat both plants and animals |
| medusa | a bowl shaped cnidarian that floats freely |
| polyp | the shape of cnidarian where the mouth faces up |
| coral reef | formed from the skeletons of dead corals |
| Annelida | the phylum of segmented worms |
| Platyhelminthes | the phylum of flat worms |
| Nematoda | the phylum of round worms |
| Planaria | a type of flatworm |
| parasite | lives in or on another organism and harms it |
| spikes | sharp needles that form a frame for the songes body |
