| A | B |
|---|
| none | type of extra covering that amphibian skin has |
| two | Fish have how many chambers in their heart? |
| three | Amphibians and reptiles have how many chambers in their heart? |
| four | Birds and mammals have how many chambers in their heart? |
| gills | internal organ of respiration in tadpoles (juvenile frogs) |
| lungs | internal organ of respiration in adult frogs |
| skin | external organ of respiration in frogs |
| double life | The word "amphibian" means this and refers to the fact that in youth they live in water and as adults they live on land |
| frog | common amphibian that is an agile and powerful jumper with very smooth skin |
| toad | common amphibian that is somewhat of a clumsy jumper with dry, warty skin |
| salamander | thin amphibian with four equal-sized legs and a long, round tail |
| newt | thin and very delicate amphibian with four equal-sized legs and a long, flat tail |
| tympanic membrane | organ of hearing in frogs |
| external nares or nostrils | two openings on the dorsal side of a frog's head that have flaps to keep water from entering |
| Eustacian tubes | two openings in the roof of a frog's mouth that lead to the inside of the ear and tympanic membrane |
| glottis | slit-like opening in back of a frog's mouth that leads to the lungs |
| gullet | opening in the back of a frog's mouth that leads to the esophagus and stomach |
| cloaca | structure in the posterior part of a frog which is a common outlet for the excretory, digestive, and reproductive systems |
| kidneys | frogs have a pair of oval, dark brownish-red organs near the backbone that take liquid wastes out of the blood |
| mesentery | a frog's small intestine is held in its place by transparent membranes called ___. |
| liver | this large gland in the upper part of a frog's chest cavity has three lobes (sections) and works to keep the blood free of toxins |
| gall bladder | small greenish sac that hangs under a frog's liver and helps digest fats |
| tongue | this prey-catching organ is rooted in the front of a frog's mouth |
