What evidence is found in the fossil record that shows that early ancestors of humans walked upright and used bipedal locomotion? Select all that apply.   a On the bottom of the skull, there is a place where the backbone attaches. b Fossilized bones of the hip and pelvis are shorter in height. c The feet evolved five toes from three toes. d The backbone was attached to the back of the skull.

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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.