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Amphibians and reptiles

Across
Egg with shell with membranes for nutrients
Two holes in head
Reptiles that became mammals
Survival of the fittest
Cold blooded
Top part of turtle shell
Fish with no lobe fins
Bottom part of turtle shell
Down
No holes in head
One hole in head
Egg with no shell
The third eye
Body changes from one form to another
Lives on land
Four limbs