Done by : Ayesha Al Ali
Animals theme units
Mammals are the group of vertebrate animals that form the class Mammalia. They have fur and a very precise kind of temperature regulation. The females bear live young and produce milk for the young. Parental care of the young is universal among mammals, and it is essential because live birth limits the number of offsprings.
- Nearly all reptiles are cold blooded.The first reptiles are believed to have evolved around 320 million years ago.Reptiles use a variety of methods to defend themselves from dangerous situations, such as avoidance, camouflage, hissing and biting.
The number of insect species is believed to be between six and ten million.Insect bodies have three parts, the thorax, abdomen, and head.Insects have two antennae.Insects have three pairs of legs.Some insects, such as Gerridae (water striders), can walk on the surface of the water.Bees, termites, and ants live in well organized social colonies.
A fish is an animal that lives and breathes in water. All fish are vertebrates (have a backbone) and most breathe through gills and have fins and scales.
Fish make up about half of all known vertebrate species. Fish have been on the earth for more than 500 million years. Fish were well established long before dinosaurs roamed the earth.
The 25,000 known species of fish are divided into three main groups. There are three classes of fish: jawless, cartilaginous, and bony. All fish have a backbone.