Mention two similarities between 
a. Aves and mammals
b. Frog and crocodile
c. Turtle and pila


The similarities between the two are:

a. Aves and mammals - They both are warm-blooded animals and have a four-chambered heart. 

b. Frog and crocodile - Both can live on land as well as water. Both use lungs for breathing

c. Turtle and Pila - Both have a hard covering protecting their body. Both are oviparous. 

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Differentiate between
Chondrichthyes and Osteichthyes


Chondrichthyes Osteichthyes
They have cartiligionous endoskeleton They have bony endoskeleton
They have placoid scales  They have cycloid scales
e.g Scoliodon e.g Rohu
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