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Most reptiles
and have internal fertilization. Reptile eggs are amniotic, so they can be laid on land instead of in water. Reptiles do not have a larval stage, and their hatchlings are relatively mature. Reptile parents provide little if any care to their young.Most reptiles are characterized by a period of rapid juvenile growth that slows upon reaching full adulthood. Growth then ceases altogether a few years after maturity. In contrast, some large-bodied species likely have what is known as indeterminate, or attenuated, growth.Snakes reproduce by internal fertilization and either give birth to live young or lay eggs, depending on the species. Female live-bearing snakes will find a sheltered location to give birth before abandoning the young to fend for themselves.
What kind of development do reptiles have?
Most reptiles are characterized by a period of rapid juvenile growth that slows upon reaching full adulthood. Growth then ceases altogether a few years after maturity. In contrast, some large-bodied species likely have what is known as indeterminate, or attenuated, growth.
Do snakes have internal or external development?
Snakes reproduce by internal fertilization and either give birth to live young or lay eggs, depending on the species. Female live-bearing snakes will find a sheltered location to give birth before abandoning the young to fend for themselves.
Reptiles | Educational Video for Kids
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Do reptiles have external?
In humans and other amniotes, there’s only one external genital structure — the human penis, for example. In snakes and lizards, the external genitals get a little funkier. These reptiles have paired external genitals, even though they only use one at a time during mating.
Do mammals have internal or external development?
The offspring develops in the female and is born alive. This occurs in most mammals, some cartilaginous fish, and a few reptiles, making these animals viviparous. Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land.
How did reptiles evolve?
Reptiles originally descended from early limbed vertebrates that invaded the land about 70 million years before the Mesozoic (Benton 2004). These reptilian ancestors lost their gills at one point in time, so their descendents could not breathe in water unlike fish or some amphibians.
What adaptations do reptiles have for living on land?
Reptiles developed thick, scaly skin that helps conserve moisture inside their bodies, an essential feature that helps them survive not only on land, but in dry, desert areas as well. The skin is waterproof — not so much to keep water out, but rather to keep it in.
Do lizards have internal or external fertilization?
Summary. Most reptiles reproduce sexually and have internal fertilization. Reptile eggs are amniotic, so they can be laid on land instead of in water. Reptiles do not have a larval stage, and their hatchlings are relatively mature.
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Is Crocodile internal or external fertilization?
Like all reptiles, saltwater crocodiles reproduce via internal fertilization, and females carefully look over their nests after laying a clutch of approximately 50 eggs.
What animals have external fertilization?
Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.
Do snakes fart?
They don’t pass gas, but they often will defecate and urinate in an attempt to scare predators off. Some snakes also have well-developed musk or scent glands that open into the vent, and those species will often release this odiferous, noxious liquid when alarmed or threatened. It is a nasty-smelling liquid, for sure.
Do reptiles have external ears?
Some reptiles, like snakes have no visible ears at all, whereas others have much simpler designs when compared to those that stick out on most mammals. Some reptiles, notably snakes, don’t have ears at all.
What are the characteristics of reptiles?
- Reptiles are vertebrates. They have backbones.
- Their bodies are completely covered with scales.
- They are cold-blooded.
- Reptiles produce shelled eggs or bear live young.
- All species fertilize eggs internally.
- All species of reptiles have at least one lung.
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Is frog internal or external fertilization?
In most species of frogs, fertilization is external. The male frog grabs the female’s back and fertilizes the eggs as the female frog releases them (Figure 2.2B). Rana pipiens usually lays around 2500 eggs, while the bullfrog, Rana catesbiana, can lay as many as 20,000.
Are birds and reptiles oviparous?
Oviparity occurs in all birds, most reptiles, some fishes, and most Arthropoda. Among mammals, the monotremes (four species of echidna, and the platypus) are oviparous.
Is fertilization in birds internal or external?
Birds. Most birds do not have penises, but achieve internal fertilization via cloacal contact (or “cloaca kiss”).
What is the origin of reptiles?
The origin of the reptiles lies about 320–310 million years ago, in the swamps of the late Carboniferous period, when the first reptiles evolved from advanced reptiliomorph labyrinthodonts.
Why are reptiles so successful?
The success of this terrestrial vertebrate group is due in large part to the evolution of shelled, large-yolked eggs in which the embryo has an independent water supply. This advance, as well as the development of internal fertilization, enabled reptiles to be the first vertebrates to sever their ties with water.
How did reptiles evolved into birds?
Although the living reptiles birds are most closely related to are crocodilians (archosaurs), when it comes to their relation to dinosaurs, birds evolved from theropod dinosaurs. These theropods share over 100 traits with modern birds.
What adaptations do reptiles have?
One of the key adaptations that permitted reptiles to live on land was the development of their scaly skin which contains the protein keratin and waxy lipids, reducing water loss from the skin. Due to this occlusive skin, reptiles cannot use their skin for respiration, as do amphibians; all breathe with lungs.
What are the adaptations that help a reptile which has no limbs to move?
Answer. Answer: Reptiles adapted scales to help minimize water loss from their bodies and help protect them from predators. Some reptiles, such as the snake, adapted clear scales that cover and protect their eyes.
What characteristics make reptiles less dependent on a source of external water?
The skin of reptiles is covered in impermeable scales and they are able to retain water very effectively. Their eggs are covered by a hard shell, providing a sealed environment for the developing embryo, which does not depend on external sources of water.
How are reptiles born?
All reptiles, including aquatic ones, lay their eggs on land. Reptiles reproduce sexually through internal fertilization; some species are ovoviviparous (lay eggs) and others are viviparous (live birth).
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Are reptiles endothermic or ectothermic?
Reptiles and amphibians are ectotherms, while birds are endotherms. An ectotherm (reptile/amphibian) relies primarily on its external environment to regulate the temperature of its body.
Do reptiles have reproductive organs?
From spiky penises to an extra clitoris, reptile reproductive parts don’t lack for variety. More than 10,000 reptile species in every shape and size scurry and slither across Earth, from garter snakes to crocodiles — and their nether regions are just as wildly varied.
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