Cannot be divided into mirror images. Example: Sponges have no true organization and are the only animals without real tissues or organs. They are simple invertebrates.

A body plan in which an organism can be divided along only one plane of its body to produce two mirror images that are alike. For Example: Worms and all vertebrates simple and complex.

A mammal in which the female has a pouch where offspring develop after birth. For Example: Kangaroos and koala bears

A mammal that lays eggs after the young hatch they are fed milk from their mothers. For Example: Duck billed platypus and the spiny anteater are members of this group. Do not mistake this for birds!

A mammal whose young develops within the mother. For example: dogs, tigers, whales, and elephants.

An organism with this symmetry has more than one line that divides this organism, arranged around a central point. For Ex: Jellyfish, sea anemones, corals, hydras, are all cnidarians of this group and simple invertebrates.

Which organism is a complex invertebrate?

Which is NOT a simple invertebrate?

Sea stars and sea cucumbers are _____.

Which animal is radially symmetrical?

How are annelid worms, such as earthworms, different from other worms?

Which of the following body features do bony fish have that sharks do NOT have?

All vertebrates are animals that have a backbone. They also have bilateral symmetry and endoskeletons.

Which animal group has the least organized body plan?

Which of the following does not have bilateral symmetry?

All _____ share the same body plan. They have muscular foot or tentacles. They all have bilateral symmetry. Ex. snails, clams, and squids, almost all these have a shell and all are complex invertebrates.

______ include sea stars, sea urchins, and sea cucumbers. They have a hardened skeleton located inside the body called endoskeleton and they are complex invertebrates.

This group includes spiders, crabs, and insects. They have a very efficient body plan with being small/light and a hard skeleton on the outside of the body called exoskeleton. They are bilateral symmetry and complex invertebrates.

Invertebrates do not have a backbone. Porifera, cnidaria, and worms are simple invertebrates.

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