Which evolutionary development is the most important to free the land vertebrates from water?

Two appendages

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Four chambered heart

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Hard shelled eggs

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Lungs

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Solution

The correct option is C Hard shelled eggs
Animals producing hard shelled eggs is a big evolutionary step for the land vertebrates to come out of water as eggs can remain alive in dry conditions. Laying of eggs on land also eliminates the ‘tadpole’ stage which needed water.

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