| Cobras and vipers have fangs that inject ____ saliva. |
dorsal |
| Wolves, owls, bats, and crickets are ____ (active at night). |
ectothermic |
| Most reptiles, amphibians, and fish are ____ (cold-blooded). |
endothermic |
| The ____ (bottom) shell of a turtle is called the plastron. |
feral |
| Domesticated animals that have returned to the wild are ____. |
nocturnal |
| The ____ (top) shell of a turtle is called the carapace. |
parasitic |
| Most mammals and birds are ____ (warm-blooded). |
venomous |
| Most roundworms are free-living. Most flatworms are ____. |
ventral |
