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The Amniotic Egg
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sunbathing
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Yes, all reptiles have a skeleton. Their skeletal system provides support, protection for internal organs, and allows for movement. The structure of the skeleton can vary among different species of reptiles.
Yes, reptiles have a digestive system that allows them to break down and absorb nutrients from their food. They have specific adaptations, such as longer intestines or specialized enzymes, to help them digest their food effectively.
These characteristics of organisms are called adaptions.
Cold-blooded: Reptiles are ectothermic, meaning they rely on external heat sources to regulate their body temperature. Scales: Reptiles have scales made of keratin that cover their bodies, providing protection and reducing water loss. Lung breathing: Reptiles breathe air using lungs, unlike amphibians that can also absorb oxygen through their skin. Oviparous: Most reptiles lay eggs with tough shells, in which the embryos develop and hatch outside the mother's body.
The amniotic egg is the feature present in reptiles and absent in amphibians that freed reptiles from dependence on water for reproduction. The amniotic egg has protective membranes and allows reptile embryos to develop on land, reducing the need for water for reproduction.
mechanical
Most reptiles reproduce sexually although some species reproduce asexually. Upon fertilization, the embryo develops inside an egg with a calcaeous shell. This egg serves to protect the embryo, prevents drying out of the amniotic layer, and allows for efficient gas exchange.
With the exception of crocodilians, reptiles and amphibians have only two chambers in their hearts: two atria and a single ventricle. The single ventricle allows oxygenated blood to mix with deoxygenated blood.