The coelem is ________   Question 2 options:   a)  an internal body cavity that every type of animals has.   b)  a fluid filled internal body cavity that provides support and cushioning to many type of organs.   c)  a fluid filled internal body cavity that contains the spinal cord.   d)  one of the 5 characteristics that are only found in chordates.  Its not found in other animals.

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Primate evolution

Primates are a relatively new species and first appeared in the fossil record nearly 55 million years ago. They may have originated as far back as the cretaceous period. Their fossils were observed in North America, Asia, and Europe. Long before the first monkeys and their prosimian relatives developed, most animal species thrived and died. The first primates did not exist until about 50-55 million years ago, even though the planet is 4.54 billion years old and the first life goes back at least 3.5 billion years. Dinosaurs had been extinct for 10 to 15 million years when this happened.