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History of Life on Earth
Transcript of History of Life on Earth
Evidence of the Past
the remains or physical evidence of an organism preserved by geological processes
Age of Fossils
How do we know how old a fossil is?
like taking your cousin to a movie) any method of determining whether an event or object is older or younger than other events or objects
Geologic Time Scale
The Changing Earth
the theory that explains how large pieces of the Earth's outermost layer, called
, move and change shape
Eras of the Geologic Time Scale
: The time from the formation of the earth,
4.6 billion years ago to about 543 million years ago
543mya - 248mya
comes from Greek words that mean "ancient life"
248mya - 65mya
comes from Greek words that mean "middle life."
The Mesozoic Era is known as the
Age of Reptiles.
65mya - today
comes from the Greek word that means "recent life."
The Cenozoic Era is called the
Age of Mammals.
any method of measuring the age of an object or event in years
Lets dig a little deeper and review!
Humans and Other Primates
Primate: a type of mammal with opposable thumbs and binocular vision
Hominid: a type of primate characterized by bipedalism, relatively long lower limbs, and lack of a tail