| A | B |
|---|
| lower invertebrate | live in aquatic environments |
| sponges | asymmetrical animals without real tissues or organs |
| cnidarians | jellyfish, sea anemones, corals, and hydras |
| radial symmetry | a body plan in which all body parts of an organism are arranged around a central point |
| cnidarians | soft bodied aquatic creatures with a mouth, tentacles, muscle tissues, and stinger cells |
| asymmetrical | a body plan which cannot be divided into mirror images |
| bilateral symmetry | a body plan in which an organism can be divided along only one plane of their body to produce two mirror images |
| flatworm | a worm with a flat body and a head with simple eyes; has one body opening |
| roundworm | live inside the bodies of other animals; one of the most plentiful worms on Earth with a simple digestive and nervous system |
| segmented worms | have a body plan divided into sections; 2-way digestive system and organs |
| clams and squids | mollusks |
| mollusks | complex vertebrate animals with bilateral symmetry, a muscular foot, mantel, and specialized organs |
| echinoderms | have tube feet and a water pressure system that helps them food, breathe, and move |
| sea stars and sea cucumbers | echinoderms |
| arthropods | largest animal group on Earth that includes crabs and insects` |
| three kinds of fish | jawless, cartilaginous, and bony |
| lamprey and hagfish | jawless fish |
| sharks and skates | cartilaginous fish |
| amphibians | frogs, toads, and salamanders; spend time on land and in water |
| reptiles | coldblooded animals thick, scaly, waterproof skin |
| cold-blooded | animals that cannot automatically keep their body temperature steady |
| birds | warm-blooded animals with feathers and hollow bones |
| mammals | warm-blooded animals with hair and large brains; can produce milk |
| monotreme | a mammal that lays eggs; young are fed milk from mother ( duck-billed platypus) |
| marsupial | carry their developing young in pouch (kangaroos and koala bears) |
| placental | develop within its mother; are born more mature than offspring of marsupial ( humans, tigers, dogs, etc) |
