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This means oviparous animals lay eggs. These eggs develop and hatch into young individuals. In contrast, viviparous animals are born as live young individuals. Therefore, they do not lay eggs. Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals.

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Vital  functions

There body temperature change acording the temperature of there abitat.

Respiration

Water give oxigen to the blood when its pass through the gills and carries away carbon dioxide.

Characteristics

Strong muscle: move there bodies when they swim

Backbone

Smooth bodies covered with scales

Fins: to swim faster and chang the direction and have stability.

Types of fish
There are two types of fish

1. Have a skeleton made of cartilage(cartilagenous fish)

2. Have a skeleton of bone (bony fish)

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Characteristics

They are tetrapods(from tetra, four and feet) and their limbs suport them.

Backbone

They have thin, moist skin. A sticky mucus produced by glands under thir skin helps them stay moist.

vital function

They are cold blood. Their body changes acording to the enviroment.

The metamorphosi of frogs

Frogs are aquaticanimals and herivores. They develop until they become adult amphibians

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Chracteristics

Their skaly skin is tough and dry. They have a scales made of veratinethat protect them from dehydration.

Backbone

They are tetrapods their legs are adapted for walking and climbing or swiming

Vital functions

They are ecothermic or cold blood animals

They breath through lungs

Many reptiles are cornivores and hant there prey

They are oviparous. Their eggs, wich can be  lathery or hard shelle, contain a series of sacs that provide food and protection to the embyro.

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Characteristics

They don't have teeth instead they have a strong beak

Backbone

They have feathers on their body and feathers on their legs

Their bodies are fusiform and their neck are ussualy long

Vital functions

They are endothermic

They breath through lungs

Their eating habits

They lay omniptic eggs with hard sheel, so they are oviparous

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Mammals for kids - Vertebrate animals - Natural Science For Kids

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Characteristics

They have different kinds of glands. The most characteristic are the mammary glands that produce milk to feed their young

Backbone

Mammals aretetrapods

Their bodys are covered y hair or far

Vital functions

Like birds, mammals are enothermic animals.

They breath through their lungs

They have a very varied eating habits

They have a very developed nervous system