Charles was often sick, but he worked hard. He wrote many books about the wonders he had seen., In 1836, Charles returned home. He married a woman named Emma. They had ten children., Charles was sick at sea, but he loved his adventures. He went to new lands., He had seen many types of birds and beetles. These, too, were alike but different. The different types are called species., Charles had seen many types of tortoises. They were alike but different. Charles wondered why.

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