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The Human Family' Earliest Ancestors
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The Human Family' Earliest Ancestors
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The Human Family' Earliest AncestorsWhen did Ardi live? - correct answer-4.4 million years ago.
What is Ardi short for? - correct answer-Ardipithecus ramidus
Why is the discovery of Ardi significant? - correct answer-Ardi represents an early stage of
human evolution when an ancient ape body plan was being remodeled to live in two worlds-
in the trees and on the ground, where hominids increasingly foraged for plants, eggs, and
small critters.The Ardi research also challenged the long held views that hominids evolved in
a grassy savanna.
What do her physical characteristics tell us about her species mode of locomotion, and how
they lived? - correct answer-Ardi walked upright as evidenced by a cast of her upper pelvic
blades, which are shorter and broader than an ape's. Ardi didn't walk like us though. Ardi's
lower pelvis, like chimps, had powerful hip and thigh muscles that would have made it
difficult to run as fast or as far as modern humans. And she had an opposable big toe, which
suggests she still spent a lot of time in trees.
When did Homo erectus arise? - correct answer-1.8 million years ago.
What genus and species is Lucy? When did she live? What are her physical characteristics?
What do her physical characteristics tell us about her? - correct answer-At 3.2 million years
old, Lucy was remarkably primitive, with a brain and body about the size of a chimp's. But
her ankle, knee, and pelvis showed that she walked upright like us. This meant Lucy was a
hominid- only humans and our close relatives in the human family habitually walk upright on
the ground. A member of the species, Australopithecus afarensis, which lived from 3.9
million to 2.9 million years ago, Lucy helped answer some key questions. She confirmed that
upright walking evolved long before hominoids began using tools- about 2.6 million years
ago- and before their brains began to expand dramatically. She was 4 ft 100 and 110
pounds.
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