The class of animals to which snakes, alligators and turtles belong.
What is Reptilia?
100
The class to which all birds belong.
What is aves?
100
This class of animals is named after the fact that they can provide __________ for their offspring.
What is milk?
200
Blood rushes through these in one direction while oxygen is extracted from water moving in the opposite direction.
What are gills?
200
These are used to help amphibians breathe in water, land and as tadpoles.
What are gills, lungs and skin?
200
Living mostly on land, reptiles rely on the added surface area provided by these structures within their lungs to absorb enough oxygen to support cell respiration.
What are alveoli?
200
Birds have this special physical adaptation that allows for continuous air movement within their lungs.
What are air sacs?
200
Mammals can travel great distances because their lungs have adapted by adding more of these in their lungs than what reptiles have in theirs.
What are more alveoli?
300
A fish has this number of heart chambers.
What is 2?
300
An amphibian has this many heart chambers.
What is 3?
300
Most reptiles have three but some have this number of heart chambers.
What is 4?
300
Birds have 4 chambers in their heart which includes 2 ventricles and 2 of these.
What is atria?
300
Like birds, mammals have four heart chambers, in which blood makes this many loops.
What is 2?
400
Living in water has its difficulties. Fish have to keep water and salt concentrations in balance because water and salt move from _________ to __________ concentrations.
What is high to low?
400
Amphibians have an interesting way of taking in water across their skin without drinking it called this.
What is osmosis?
400
Reptiles unlike fish and amphibians do not have to lay eggs in or near water to stay moist because they lay these types of eggs.
What is amniotic?
400
All animals, including birds, depend on these organs to help them keep a balance of salt, wastes and water in their system so they do not dehydrate.
What are kidneys?
400
Mammals like other animals lose water through urination and evaporation but they are the only animals that lose water in this way when overheated.
What is sweating?
500
Fish generally reproduce through external fertilization in an event called this.
What is spawning?
500
Amphibians must change forms in their development from larvae to adult. This process is called _________.
What is metamorphosis?
500
This is the term for "live birth" as seen in some reptiles which unlike fish and amphibians, generally fertilize eggs internally.
What is viviparous?
500
While birds' amniotic eggs can survive on land because they contain the required nutrients and water, they need warmth provided by hens in this process.
What is incubation?
500
Most mammals have live births but this subclass of mammals produces two egg layers, the echidnas and platypuses.