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The amnion is a semi-permeable membrane that retains moisture within the egg, thus preventing it from drying out, but permits the exchange of gasses, thus enabling the developing animal to breathe. With its evolution, it became possible for the amniotes (such as reptiles) to lay their eggs away from water and still successfully reproduce, as all embryos need to develop in a moisture-rich environment. Amphibian eggs lack the amnion, just as all the early tetrapod eggs did, and they could never lay their eggs in a dry environment, as their embryos would die long before they fully developed.
Wiki User
∙ 10y ago
Wiki User
∙ 12y agobceause their eggs hatch from outside of their body and there is no nourishing material for zygot and land has vesy drastic conditions for formation of and development of zygot
Wiki User
∙ 7y agoIt is not so simple. Most reptiles do have amniotic eggs, but a few species give live birth. Conversely, birds and monotreme mammals also lay amniotic eggs.
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The feature present in reptiles and absent in amphibians that freed reptiles from dependence on water for reproduction is?
the amniotic egg
How is an amniotic egg important adaptation for reptiles?
The amniotic egg allows reptiles to reproduce on land, away from water.
What advance allowed reptiles to reproduce away from water?
The Amniotic egg. Remember, reptiles are believed to have evolved from amphibians. Where do amphibians lay there eggs? - The water. Why? because their eggs are soft. The reptiles are the first to lay the amniotic egg which has a hard shell. If an amphibian tried to lay its egg on land, gravity would squad it because an amphibian's egg is jelly like. With the hard shell of the amniotic egg, reptiles have greater change of reproduction.
Does the octopus have an amniotic egg?
No, reptiles, mammals and birds have amniotic eggs because they lay their eggs on land.
Is a chicken egg amniotic?
Mammals, birds, and reptiles lay amniotic eggs, so, yes, a chicken lays amniotic eggs. Amniotic eggs contain a yolk and aid in gas and energy exchange.
Is a amniotic egg a characteristic of a reptile?
It is not so simple. Most reptiles do have amniotic eggs, but a few species give live birth. Conversely, birds and monotreme mammals also lay amniotic eggs.
What group evolved from the amphibians with the development of the amniotic egg?
reptiles
What allows reptiles to reproduce without water?
The Amniotic Egg
Vertebrates became truly terrestrial with the development of the amniotic egg in what?
reptiles
The feature present in reptiles and absent in amphibians that freed reptiles from dependence on water for reproduction is?
the amniotic egg
How is an amniotic egg important adaptation for reptiles?
The amniotic egg allows reptiles to reproduce on land, away from water.
What are two derived characteristics that allowed reptiles to become the first entirely terrestrial vertebrates?
Plato Users: A. Amniotic Egg, and Dry Scaly Skin.
Does an owl have an amniotic egg?
Mammals, birds, and reptiles lay amniotic eggs, so, yes, owls have amniotic eggs. Amniotic eggs contain a yolk and aid in gas and energy exchange.
What advance allowed reptiles to reproduce away from water?
The Amniotic egg. Remember, reptiles are believed to have evolved from amphibians. Where do amphibians lay there eggs? - The water. Why? because their eggs are soft. The reptiles are the first to lay the amniotic egg which has a hard shell. If an amphibian tried to lay its egg on land, gravity would squad it because an amphibian's egg is jelly like. With the hard shell of the amniotic egg, reptiles have greater change of reproduction.
Does the octopus have an amniotic egg?
No, reptiles, mammals and birds have amniotic eggs because they lay their eggs on land.
Is a chicken egg amniotic?
Mammals, birds, and reptiles lay amniotic eggs, so, yes, a chicken lays amniotic eggs. Amniotic eggs contain a yolk and aid in gas and energy exchange.
Does the development of the amniotic egg make early reptiles less dependent on water?
Yes! :) hope it helped
