Reptiles
All reptiles have this skin:
Scaly
Fish have this that extracts oxygen from the water:
Gills
Birds are the only animals with
Feathers
All amphibians must live near:
They have this covering their body
Hair/fur
Reptiles evolved from:
Amphibians
Fish are covered in
Scales
There are how many main bird groups
Two
There are this many major types of amphibians
3
Mammals are the only class that can give this to their young
Milk/ live birth
There are how many main reptile groups:
Fish reproduce by:
laying eggs
Birds evolved from
Dinosaurs
Amphibians' blood is:
Cold-blooded
Mammals metabolism is
Warm-blooded
Reptiles were the world's first:
Amniotes
Over this many of fish species are threatened by extinction:
1000
Sound and color
All amphibians undergo
Metamorphosis
All mammals share the same
Basic Body Plan
Most reptiles have this kind of heart:
There are over this many known species of fish
30000
There are about this many known bird species
10,000
They consume their prey:
Whole
There are approximately this number of mammal species
5000