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245 million years ago, the continents were one giant landmass called _________.
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
What is one important biological event that occurred during the Precambrian time?
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
Why are there usually more fossils from the Cenozoic era than from any other geologic era.
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
Scientists think the first cells were anaerobic because there was no oxygen available when they developed.
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
The ozone is important because it ________________________.
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
What percentage of the original substances will be present after two half-lives have occurred?
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
Which of the following is not an evolutionary change in early hominids that lead to the rise of modern humans?
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
The group of mammals including apes, monkeys, humans, and prosimians.
life began
Pangea
25%
primates
It blocks UV radiation from the sun.
True
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
bipedalism
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