Animals
More than a million species of animals are discovered so far on Earth, and many are, no doubt, yet to be discovered as long as people continue to explore woods and the sea, and many other living areas of our planet.
Living world is divided into two main kingdoms - plant and animal.
Because of the huge diversity of wildlife-which includes the tiny protozoan organisms, visible only with a microscope, to the gigantic blue whale, 30 meters long and weighing over 100 tons-is not easy to define animals.However, there are certain traits that, viewed together, make the difference between animals and plants. The main difference is in the eating, as in getting energy. Unlike green plants, animals can not make their own food themselves, and therefore need to use a preexisting organic matter - other plants and animals. That kind of food is found by animals that are actively moving. Animals have a nervous system that controls their movements and sensory organs that help with finding food. These characteristics differ the animal organisms from plants. However, there is a sequence of microscopic organisms , which don't completely fit in these two kingdoms. They include living beings that swim freely and have sensory receptors , for example eye stains, i.e. simple senses, which are sometimes fed like plants-by taking water and carbon-dioxide and produce sugars out of them -and sometimes like animals.
Living world is divided into two main kingdoms - plant and animal.
Because of the huge diversity of wildlife-which includes the tiny protozoan organisms, visible only with a microscope, to the gigantic blue whale, 30 meters long and weighing over 100 tons-is not easy to define animals.However, there are certain traits that, viewed together, make the difference between animals and plants. The main difference is in the eating, as in getting energy. Unlike green plants, animals can not make their own food themselves, and therefore need to use a preexisting organic matter - other plants and animals. That kind of food is found by animals that are actively moving. Animals have a nervous system that controls their movements and sensory organs that help with finding food. These characteristics differ the animal organisms from plants. However, there is a sequence of microscopic organisms , which don't completely fit in these two kingdoms. They include living beings that swim freely and have sensory receptors , for example eye stains, i.e. simple senses, which are sometimes fed like plants-by taking water and carbon-dioxide and produce sugars out of them -and sometimes like animals.