|Frogs, newts, salamanders, and toads are classified as ____.
|Hermit crabs carry salvaged empty ____ for protection.
|The largest and most complex marine forms of algae are ____.
|Earthworms and leeches are ____ (segmented worms).
|Most reptiles are thick-skinned and are covered by ____.
|Hedgehogs, moles, and shrews are ____.
|Unlike female elk, some female caribou grow ____.
|Sand dollars, sea urchins, and starfish are ____.