By Sherman Hollar
Amazing through their hugely constructed psychological colleges and their capability for cause, people are frequently acknowledged to reign sovereign within the animal nation. With their advanced interactions, complicated social buildings, and huge variety of displayed feelings, besides the fact that, all creatures might be acknowledged to give a contribution uniquely to the planet and to the subsistence of all different beings. This colourful quantity surveys a number of the participants of the animal nation and the behavior, behaviors, and actual features that unite and distinguish all animals.
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Extra info for A Closer Look at the Animal Kingdom (Introduction to Biology)
60 C hapter 4 Animals with Backbones T he most complex members of the animal kingdom belong to the phylum Chordata. Most members of this phylum are vertebrates—that is, they have a backbone. Groups of primitive chordates known as tunicates and cephalochordates, however, do not have a backbone. The major subdivisions of the vertebrates are the fish, amphibians, reptiles, birds, and mammals. Members of this phylum possess the following structures at some period of their life, either as embryos or as adults: a notochord, a nerve tube, and pharyngeal gill slits or pouches.
It has been suggested that the grassy plains of that region began slowly eroding some 10,000 years ago. Humans were forced to share smaller and smaller oases of fertile land with wild animals. People gradually learned how to control the animals. Some animals were bred in Sheep stand in a snow-covered field on December 25, 2010, in Letterkenny, Ireland. Gareth Cattermole/Getty Images 48 clAssIfIcAtIon And BehAVIor captivity, and from them the domestic strains developed. Another theory of how domestication came about points to the widespread human practice of making pets of captured young and crippled animals.
Tony Karumba/AFP/Getty Images 33 A closer look At the AnImAl kIngdom instance, why some animals migrate or live together in groups—and how their behavior helps them and their offspring survive. 5 billion years ago, roughly a billion years after the Earth was formed. These early organisms may have lived in warm, salty pools containing carbon, nitrogen, oxygen, and hydrogen. Later organisms developed from having one cell to having many cells, becoming more and more complex. As the environment changed over many millions of years, these early organisms underwent a process known as natural selection, giving rise in time to the first animals that lived in the oceans.