Show:
Mammals
Reptiles
Amphibians
Avians
Fish
100
These mammals lay eggs.
What are monotremes.
100
Reptiles must stay near a source of warmth because they have this condition.
What is cold-blooded?
100
These hop hop hoppy amphibians have dry and bumpy skin.
What are toads?
100
Most physical aspects of a bird's evolution are geared to make this possible.
What is flight?
100
The dorsal fin appears on this area of the fish.
What is the top or back?
200
The time the embryo spends in the uterus until birth.
What is the gestational period?
200
This type of feather keeps a bird warm.
What are down feathers?
200
Fish do not give live birth; rather young are born from these.
What are eggs?
300
23 months
What is the gestational period for an elephant?
300
A bird's bones have this special characteristic.
What is that they are hollow?
300
Gills help fish do this.
What is breathe?
400
Verterbae, types of teeth, and the ability to learn things from their parents.
What are some characteristics of a mammal?
400
These types of feathers help the bird fly.
What are contour feathers?
500
This type of mammal carries its young in its pouch.
What is a marsupial?
500
These are distributed throughout a bird's body and increase its distribution of oxygen during flight.
What are air sacs?