Animal Cells by Penny Dowdy PDF

By Penny Dowdy

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Dogs are not the only animal in which purebreds can matter to people. Cat and horse owners sometimes want purebreds, too. The traits of a specific breed appeal to owners. Many animal shows allow only purebreds to compete. For example, the Westminster Dog Show allows purebred dogs to compete against each other. The contest rewards the dog that best shows the traits of the breed. Leopard-spotted Appaloosas are especially prized. 38 Dalmations have many positive traits but carry a gene for deafness.

Humans have many body cavities. The head is a cavity for the brain. The abdomen is a cavity for the stomach, liver, kidneys, and more. We have another cavity for the lungs and heart. Finally, the cells of complex animals specialize. All complex animals have many different types of cells, from the neurons in the brain to the white blood cells that fight disease. Neurons have branches called dendrites. They work like antennae. Big Brain The scientific word for developing a nervous system is cephalization.

Jellyfish have more kinds of cells than sponges do. One Old Sponge Sponges may have been one of the earliest animals to develop on Earth. How do we know? The oldest producing oil field in the world (in Oman, east of Saudi Arabia) has chemicals that can be linked to sponges. These early sponges probably lived about 600 million years ago. 31 Complex Animals We know many examples of animals far more complex than sponges and cnidarians. You, for one! Humans are complex animals. Whales and house cats are, too.

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Animal Cells by Penny Dowdy


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