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Most scientists believe an asteroid struck Earth 66 MYA. This is what killed the dinosaurs and let other types of animals take over.

One of the smallest fish in the world is the dwarf pygmy goby. It grows to be 3/8ths of an inch (13mm). It is a ray-finned, freshwater fish from the Philippines and Indonesia. The whale shark is the largest fish in the world. It can grow to be 40 feet (12m) long and weigh 20 tons (18mt). They live in warm saltwater.

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Making Connections


What part of the evolution of fish surprised you the most? Please explain your answer.


Have you read any other books about animal evolution? What did the evolution of those animals have in common with fish evolution?


There are thousands of species of fish in the world. With the help of an adult, look up information about your favorite one. Write a short paragraph about your favorite fish.

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