List all parts of the amniotic egg and explain

amniotic egg. A shelled, water-retaining egg with four membranes that enables reptiles, birds, and egg-laying mammals to complete their life cycles on dry land.

amnion-thin innermost membranous sac that surrounds the developing embryo of higher vertebrates (reptiles, birds and mammals) that secretes amniotic fluid

amniotic fluid-fluid inside the amnion that helps give an environment that maintains chemical consistancy and temperature stability

yolk sac-2nd membrane enclosing the yolk of eggs full of nutrients loaded with proteins and fats

allantois-3rd membrane which stores metabolic waste; grows over time and eventually acts a respiratory surface exchanging oxygen and carbon dioxide

chorion-4th and outermost protective membrane fused to allantois while supporting the allantois's function of gas exchange

leathery shell-The eggs of Class Reptilia are specialized and adapted for land

cleodic egg-amniotic egg with a shell that is either leathery of hard

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".