The crocodilians that live only in the southeastern United States and along China's Yangtze River are the __________.

• Crocodile

• Alligators

• Gila monster

• Caimans

The round, tough layers of skin covering the turtle's shell are called the ____________.

• plastron
• carapace
• scutes
• scales

Most turtles are ___________.

• sea turtles

• land turtles

• freshwater turtles

• tortoises

One of the only reptiles that guards its eggs until they hatch is the __________.

• iguana
• tortoise
• chameleon
• crocodile

What type of cloud is this?

• Nimbus cloud
• Cumulus cloud
• Stratus cloud
• Cirrus cloud

What type of cloud is this?

• Cumulus
• Nimbostratus
• Cirrus
• Stratus

What type of cloud is this?

• Stratus
• Cumulus
• Nimbus
• Sirius

The largest salamander is the rare ________.

• Japanese giant salamander
• Mexican giant salamander

• African clawed salamander
• Mexican axolotl

Young amphibians breathe with _______ until they develop lungs.

• lungs
• gills
• gills and lungs
• skin

Amphibians protect themselves by secreting a mildly poisonous _______.

• slime

• blood
• venom
• saliva