Fish
Amphibians
Reptiles
Birds
Mammals
100
This is the name of the structure through which fish filter oxygen from the surrounding water.
Gills
100
This is the term given to a newly hatched frog egg.
Tadpole
100
The structure that differentiates amphibian and reptile eggs.
Tough, leathery shell
100
The feature that differentiates birds from other animals.
Feathers
100
The glands that produce milk that mammals use to feed their young.
Mammary
200
This is the name of the structure that enables bony fish to float at any water level.
Swim Bladder
200
These are the two organs that adult amphibians use to breathe.
Skin and Lungs
200
The term in which used describe how reptiles control their body temperature.
Ectothermic
200
One reason why birds are able to fly is because their bones are this.
Hollow
200
The group of mammals that the duckbill platypus and spiny anteaters belong to.
Monotremes
300
This is the type of fertilization that fish do.
External
300
The organs that tadpoles use to breathe.
Gills
300
The structure reptiles use for breathing.
Lungs
300
The bird structure that traps warm air close to the birds body.
Down feathers
300
The only marsupial native to North America.
Opossum
400
This is the most primitive type of fish.
Jawless
400
The type of fertilization in which amphibians use to reproduce.
External
400
The type of fertilization in which retiles use to reproduce.
Internal
400
The type of fertilization in which birds use to reproduce.
Internal
400
The body covering that is present on all mammals at some point of their lives.
Hair or fur
500
This is the material that the skeleton of sharks are made out of.
Cartilage
500
The stage of a frog metamorphosis in which the frog had limbs and a tail
Froglet
500
The sense used when a snake flicks its tongue out.
Smell
500
The respiratory structure that enables birds to maintain extremely efficient gas exchange.
Air sacs
500
The place in which the young of monotremes develop?
Eggs
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