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Life Science Chapter 8
Test Description: History of Life on Earth
Instructions: Answer all questions to get your test result.
1) What percentage of the original substances will be present after two half-lives have occurred?
A
50%
B
75%
C
0%
D
25%
2) Plate tectonics is the theory of how huge pieces of crust, tectonic plates, move around the globe.
A
True
B
False
3) 245 million years ago, the continents were one giant landmass called _________.
A
Laurasia
B
Pangea
C
Gondawandaland
4) The atmosphere has always been composed of oxygen.
A
True
B
False
5) The ozone is important because it ________________________.
A
You can breathe it in.
B
It uses up breathable oxygen.
C
It blocks UV radiation from the sun.
6) Where did life originate?
A
magma
B
air
C
land
D
oceans
7) The group of mammals including apes, monkeys, humans, and prosimians.
A
homo habilias
B
australopithecines
C
primates
D
hominids
8) Humans and human-like ancestors are called ___________.
A
hominids
B
promisians
C
primates
D
australopithecines
9) Scientists think the first cells were anaerobic because there was no oxygen available when they developed.
A
True
B
False
10) The first primate ancestors, called hominids, appeared during the Cenozoic era.
A
True
B
False
11) Why are there usually more fossils from the Cenozoic era than from any other geologic era.
A
There is more life
B
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
C
The Cenozoic era is the oldest era, so the fossils are found closer to the surface.
12) Which of the following is not an evolutionary change in early hominids that lead to the rise of modern humans?
A
shorter arms
B
longer legs
C
bigger brains
D
bipedalism
13) These hominids made sophisticated tools, hunted large animals, wore clothing, and cared for the sick and elderly. Their extinction is a mystery.
A
hominids in the genus Homo
B
Cro-Magnons
C
Neanderthals
D
australopithecines
14) What is one important biological event that occurred during the Precambrian time?
A
life began
B
multicellular organisms appeared
C
large mammals appeared
D
reptiles appeared
*select an answer for all questions
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