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6.Evolution
normal
The greatest evolutionary change enabling the land vertebrates to be completely free from the water. Habitat was the development of
A
Four legs
B
Four-chambered heart
C
Lungs
D
Shelled eggs and internal fertilization
Solution
Shelled eggs and internal fertilization these are the two great changes occurred in the organism, which made them free from their water life.
These two changes are seen in reptiles, birds and amphibians. But the organism, which are still completely dependent on the water do not have these the characters
Standard 12
Biology
