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______ have highly efficient circulatory systems, and complex nervous system and sensory organs.

Bacteria reproduce by ————-

Sessile animals…

Planarians

The only amphibians to entirely escape dependence on aquatic habitats are _____.

Single-celled photosynthetic protistans, including most of the euglenoids, chrysophytes, and dinoflagellates, are members of the _____ , the “pastures” of most aquatic habitats.

These _____ earth deposits are used in insulation, abrasives, and pool filters.

Which term does not describe a virus?

All echinoderms are:

An organism may have different common names that vary from area to area and language to language.