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