The Amniotic Egg
sunbathing
you put 2 and 2 together and you get 5
In Windows the File menu allows you to view file characteristics
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.
These are five characteristics of reptiles (I know you asked for four) 1. They are ectothermic vertebrates 2. Their skin has scales, but no hair or feathers 3. They have three-chambered hearts (except for alligators and crocodiles which have four-chambered hearts) 4. They have claws on their toes (except those who do not have legs, such as legless lizards) 5. They are the first animals, in evolution, to develop the amniotic egg. This allows reptiles to lay eggs on land. Vocabulary: ectothermic: Having a variable body temperature which closely matches that of the surroundings. "Cold-blooded".
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
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.
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.