Definitions

Mammals :

Mammals are a class of vertebrates characterised by warm-blood, hairy bodies, a four-chambered heart, a single jaw bone, sweat glands and - in females - mammary glands for suckling young. Some mammals, such as naked mole rats and whales have lost some or all of their hair. Almost all mammals give birth to live young, but there are a few that lay eggs. These are known as monotremes, and include the platypus.

Dinosaur :

Dinosaurs were the dominant land animals for 160 million years, making them one of the most successful groups of animals ever. The name dinosaur translates as 'terrible or wondrous lizards' and they certainly evolved in a diverse range of sizes and shapes, from the gigantic plant-eating sauropods to the quick meat-eating tyrannosaurs. They also sported an impressive array of body modifications including horns, scales and crests. So far, the remains of over 1,000 different dinosaur species have been identified from fossils though technically, birds are feathered dinosaurs, meaning dinosaurs aren't really extinct at all.

Plants:

any member of the kingdom Plantae, comprisingmulticellular organisms that typically produce their own food from norganic matter by the process of photosynthesis and that have more or less rigid cell walls containing cellulose, including vascular plants ,mosses,liverworts, and hornworts:some classification schemes mayinclude fungi, algae, bacteria, blue-green algae, and certainsingle celled eukaryotes that have plantlike qualities, asrigid cell walls or photosynthesis.

Amphibian and Reptile :

Amphibians include frogs, salamanders and caecilians. A typical amphibian has a larval stage spent in water during which it breathes through gills, and an adult stage that is less tied to water when they rely on lungs.

The reptiles are a class of vertebrates. Charateristically they are cold-blooded, have dry scaly or horny skin and a four-chambered heart. Most reptiles lay eggs with leathery shells, but a few types bear live young. Because they are cold-blooded, reptiles are more common in the tropics than in temperate regions and are not found in polar areasothers that keep their gills throughout their life.

Extinct Animals:

No longer existing or living

Birds:

Birds are a class of vertebrates. They are bipedal, warm-blooded, have a covering of feathers, and their front limbs are modified into wings. Some birds, such as penguins and ostriches, have lost the power of flight. All birds lay eggs. Because birds are warm-blooded, their eggs have to be incubated to keep the embryos inside warm, or they will perish.

Insects:

The insects are one of the most successful types of living organism, with roughly half of all species on Earth being insects. Insects are part of the Arthropod phylum, and as such have an external skeleton and jointed limbs. All insects have six legs, and are the only type of invertebrate which has evolved the ability to fly.

Evolution

1. any process of formation or growth; development: theevolution of a language; the evolution of the airplane.

2. a product of such development; something evolved: Theexploration of space is the evolution of decades of research.

3.Biology . change in the gene pool of a population fromgeneration to generation by such processes as mutation,natural selection, and genetic drift.

4. a process of gradual, peaceful, progressive change ordevelopment, as in social or economic structure orinstitutions.

5. a motion incomplete in itself, but combining with coordinatedmotions to produce a single action, as in a machine.

6. a pattern formed by or as if by a series of movements: theevolutions of a figure skater.

7. an evolving or giving off of gas, heat, etc.

mineral

–noun

any of a class of substances occurring in nature, usuallycomprising

inorganic substances, as quartz or feldspar, ofdefinite chemical

composition and usually of definite crystalstructure, but sometimes

also including rocks formed bythese substances as well as certain natural

products of organic origin, as asphalt or coal.

marine mammals

mammals inhabiting the sea; generally taken to include the cetaceans (whales, porpoise, dolphin), the sirenians (sea-cows, including manatees and dugong) and the pinnipeds (the carnivores of the group, seals, sealions, walruses). Other mammals that spend a great deal of time in the water but are not classified as marine mammals are the polar bear and the sea otter.

Earth

Earth, the third planet from the Sun, is unique in the Universe as it is currently the only planet known to support life. It has a single natural satellite, the Moon, and is the fifth largest planet in the Solar System.

Earth's distance from the Sun is thought to be one of the key reasons why it is home to widespread life. Our planet occupies what astronomers call the Goldilocks zone. Its distance from our star means it is neither too hot, nor too cold to support liquid water - thought to be a key ingredient for life. Astronomers are searching for rocky planets like ours in the Goldilocks zones of other stars.

Fish

It's strange but true that there's really no such thing as fish! Unlike with mammals and birds, not all the animals we call fish - aquatic, vertebrate animals covered with scales - descend from the same common ancestor. Put another way, if we go back to the most recent common ancestor of everything we now call fish, we find that it was also the ancestor of all four-legged, land vertebrates (tetrapods), which obviously aren't fish at all.

Biologists call this a paraphyletic collection of taxa, which in the case of fish includes hagfish, lampreys, sharks and rays, ray-finned fish, coelacanths and lungfish. Indeed, lungfish and coelacanths are more closely related to the tetrapods (mammals, birds, amphibians etc) than to fish such as ray-finned fish