Animals are multicellular, living organisms that form the primary biological kingdom Animalia. With few exceptions, animals eat organic matter, breathe oxygen, can move, reproduce sexually, can move around by sucking air, can grow from a very small shell of cells called the blastula, and consume food through digestion. In order for an animal to live it must have certain basic requirements such as space to move about, air to breathe, heat or food to eat. It must also be protected from predators and harm. The major groups of animals are land animals such as birds, amphibians, fishes, crustaceans, and reptiles, and aquatic animals such as amphibians, freshwater fish, and some forms of land-dwelling unicellular organisms such as mollusks and snails.
Animals reproduce differently than do plants. Animals reproduce via sexual division of a living cell. The male sperm, which contains a gene for male sex, travels through the female egg in a fluid-filled pouch known as a zygote. The zygote travels through the body of the mother animal and is implanted somewhere different in the body of the mother. Once there, it divides into millions of future zygotes that travel along the same reproductive route to form millions of future eggs.
The cells in an animal are called "eukaryotic" cells. Eukaryotic (or "yu") cells are similar to bacteria and plants in their ability to reproduce. Cells that line the inside of human beings are called "endogenous" cells. These are further divided into pairs of eukaryotic cells that are inserted into the openings of their paired chromosomes.
All forms of animals are categorized on the basis of whether they are eukaryotic or endosymbiotic. Endosymbiotic animals are plants and animals with a single-celled reproductive system. They reproduce by means of a mouth, a gamete (reborn) or a protozoan. The protozoan is a worm that can grow inside an endosymbiotic cell and digest the endosymbiotic cell's nutrients. For an excellent discussion of this and other organisms in the Lamarck Sea, see "Origins of Animals and Plants in the Lamarck Sea, North Carolina."
Lamarck Sea salvage specialists are most concerned with the marine animals that live in and on the bodies of the Great Salt Lake. In order for us to classify all forms of animals, we must go beyond the classification systems that were used in the first days of vertebrates. New types of animals have arisen since the split of the Old Kingdom and the New Kingdom of Animals. Animals have adapted to their environment and divided into different classes, and there are even sub-classes of animals. Some animals make their home in rocks and gravel under the sea, and some can be found in fresh water on islands, while other animals can be found inland in marshy areas and estuaries.
As you read on the main article from Taylan Evrenler, you will learn about the animals that make up each class of animals and what they are commonly found in nature. Animals are classified as Prototheria, chordae, cetacea, metathesis, sponges, method bodies, bivalves, tunicates, cephalopods, annelids and echinoderms. You will also find a brief introduction to invertebrates, including what they are, how they are classified and what animals use them for. This is a good article to read if you are starting to get interested in learning about the world of biology. You will find many more articles like this and other articles that will help you learn more about the animal kingdom.
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