By Sherman Hollar
Distinct via their hugely constructed psychological schools and their ability for cause, people are frequently stated to reign sovereign within the animal state. With their complicated interactions, difficult social constructions, and large variety of displayed feelings, even though, 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 few of the participants of the animal country and the behavior, behaviors, and actual features that unite and distinguish all animals.
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Extra resources for A Closer Look at the Animal Kingdom (Introduction to Biology)
Scientists believe that it may be closely related to the common ancestor of the vertebrates. The amphioxus has a Assorted lampreys. Buyenlarge/Archive Photos/Getty Images 63 A closer look At the AnImAl kIngdom notochord and a tubular nerve cord along the back. It does not have a well-developed brain, however, and has only traces of eyes and ears. Pigment spots along the body are sensitive to light. The pharyngeal gill slits strain food from the water. The tunicates, or sea squirts, and acorn worms are other primitive chordates.
Fish Many animals that live in water are called fish. Perch, crayfish, cuttlefish, jellyfish, and even whales and dolphins all live in water. Yet, of these animals, only the perch is a true fish. Whales and dolphins are warm-blooded mammals. The others belong to the great group of animals without backbones, called invertebrates. A fish is a cold-blooded animal that has a backbone and lives in water and breathes by means of gills. It normally has two pairs of fins in place of arms and legs, as well as several other fins.
Lampreys are among the simplest true vertebrates. They have a notochord. The skeleton is composed of cartilage. They lack jaws and paired limbs. Fish Many animals that live in water are called fish. Perch, crayfish, cuttlefish, jellyfish, and even whales and dolphins all live in water. Yet, of these animals, only the perch is a true fish. Whales and dolphins are warm-blooded mammals. The others belong to the great group of animals without backbones, called invertebrates. A fish is a cold-blooded animal that has a backbone and lives in water and breathes by means of gills.