How many chambers do birds heart have?
4
In Mammals, A hair or fur is made up of a tough protein called ____________.
Keratin
These are mammals with pouches
MURSUPIALS
Mammals and Reptiles are ---------blooded animals
...
Reptiles are characterized by their body covering called ___________.
Scales
The ___________, found on both sides of the head of the fish, are used to obtain oxygen.
gills
These animals directly give birth to a fully develop young ones.
VIVIPAROUS
Scorpions, spiders, ticks, and mites are called ________.
ARTHROPODS
In mollusks, A __________ is a tongue like organ with hundreds of teeth.
RADULA
