A reptile is a vertebrate with a backbone and skeleton. It is cold-blooded so it depends on warm temperatures to keep warm. Some will hibernate in winter. It lays leathery eggs on land and the babies look like small versions of the adults. A reptile has lungs to breathe with. Alligators and turtles are reptiles.
Reptiles have scaly skin
All reptiles are diapsids. Mammals (like you and I) are, in contrast, synapsids. So in that respect all reptiles are alike. However, I would not say they were all alike. Snakes are reptiles but lack limbs. Alligators are also reptiles, as are lizards. Tuatara, gavials, amphisbaenids, and tortoises each represent one of the four main modern orders of reptiles. They share some characteristics--just as you and I do, but I would not say they were all alike.
Reptiles are classified into four groups known as orders. The four reptile orders are classified as: crocodilia, sphenodontia, squamata, and testudines.
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 two main types of reptiles that existed in the Mesozoic Era were dinosaurs and pterosaurs. Dinosaurs were land-dwelling reptiles that roamed the Earth, while pterosaurs were flying reptiles that ruled the skies.
what are the four main characters of reptiles
There are four main classes of animals: Mammals (Mammalia), Birds (Aves), Reptiles (Reptilia), and Fish (Chondrichthyes, Agnatha, Placodermi, Actinopterygii, Sarcopterygii).
There are four main groups of reptiles: turtles, crocodilians, snakes and lizards, and tuataras. These groups encompass a diverse range of species adapted to various environments. Each group has distinct characteristics and evolutionary histories, contributing to the overall diversity of reptiles.
Reptiles have scaly skin
The main characteristics are that they are cold blooded and lay eggs. Although another is that the skin is scaley, this is not the case in all reptiles.
they have scales
All reptiles are diapsids. Mammals (like you and I) are, in contrast, synapsids. So in that respect all reptiles are alike. However, I would not say they were all alike. Snakes are reptiles but lack limbs. Alligators are also reptiles, as are lizards. Tuatara, gavials, amphisbaenids, and tortoises each represent one of the four main modern orders of reptiles. They share some characteristics--just as you and I do, but I would not say they were all alike.
Birth Rate, Death Rate, Immigration, Emigration
Reptiles and birds share enough common characteristics to be classified in the same clade called Sauropsida, which includes all modern reptiles and birds.
Inheritance of acquired characteristics is not one of Darwin's four main ideas of natural selection. His four main ideas are variation, competition, heritability, and differential reproductive success.
Lay eggs
The four main habitats are forest, grassland, aquatic (freshwater and marine), and desert. Each habitat has its own unique characteristics and supports different types of plants and animals.