advantages: gas exchange is possible via the chorion, there isn't a larval stage, the egg offers some protection
disadvantages: must be laid on land, stationary / must be protected from predators
An amniotic egg is externally coated by a partially-permeable shell (to allow for gas exchange whilst still retaining essential fluids like water) which is usually calcareous but can be leathery. Internally it contains the embryo lying next to a nutrient-rich yolk sac and an "allantois", a sac used to store embryonic waste materials. The embryo and aforementioned associated structures are all wrapped up in several different membranes and immersed in liquid.
The significance of the evolution of the amniotic egg is that it afforded greater independence to land animals; they would no longer have to return to water to lay their eggs as there was no risk of the eggs drying out. The amniotic egg also eliminates the need for a larval stage, allowing the young to mature further prior to hatching.
It is the shape of the egg cell
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.
No, only reptiles, mammals, and birds have amniotic eggs.
Mammals, birds, and reptiles lay amniotic eggs, and frogs and toads are none of these, so, no, frogs and toads do not have amniotic eggs. Amniotic eggs contain a yolk and aid in gas and energy exchange.
No, reptiles, mammals and birds have amniotic eggs because they lay their eggs on land.
Because, amniotic eggs contains placenta that could be only developed inside the females womb.
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.
No. An amniotic egg is a bird or reptile egg, with a shell. Only vertebrates can have amniotic eggs. ^^ By extention, mammals also have amniotic eggs, but they're reduced in placental mammals (live birth). Platypi and echidnas still lay amniotic eggs though.
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.
No, only reptiles, mammals, and birds have amniotic eggs.
Yes, all reptiles lay amniotic eggs.
Mammals, birds, and reptiles lay amniotic eggs, and frogs and toads are none of these, so, no, frogs and toads do not have amniotic eggs. Amniotic eggs contain a yolk and aid in gas and energy exchange.
Monotremes lay amniotic eggs. Monotremes include just the platypus, the short-beaked echidna and the long-beaked echidna.There are two mammals that lay amniotic eggs. The two mammals that lay amniotic eggs are echidna and platypus.
The Australian Bearded Dragon lay amniotic eggs. Their offspring are covered in amniotic gel for protection.
No, reptiles, mammals and birds have amniotic eggs because they lay their eggs on land.
No. An amniotic egg will normally have multiple parts, like a chicken egg. An aminiotic egg also is surrounded by amniotic fluid. A fish egg is a small embryo surrounded by a protective gel like substance that is similar to a shell.
allantois
Reptiles and birds have amniotic eggs, as well as the occasional mammal like the platypus and echidna.