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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
25%
C
0%
D
75%
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
Pangea
B
Laurasia
C
Gondawandaland
4) The atmosphere has always been composed of oxygen.
A
False
B
True
5) The ozone is important because it ________________________.
A
It uses up breathable oxygen.
B
You can breathe it in.
C
It blocks UV radiation from the sun.
6) Where did life originate?
A
oceans
B
air
C
land
D
magma
7) The group of mammals including apes, monkeys, humans, and prosimians.
A
homo habilias
B
hominids
C
primates
D
australopithecines
8) Humans and human-like ancestors are called ___________.
A
hominids
B
primates
C
promisians
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
The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.
B
The Cenozoic era is the oldest era, so the fossils are found closer to the surface.
C
There is more life
12) Which of the following is not an evolutionary change in early hominids that lead to the rise of modern humans?
A
longer legs
B
shorter arms
C
bipedalism
D
bigger brains
13) These hominids made sophisticated tools, hunted large animals, wore clothing, and cared for the sick and elderly. Their extinction is a mystery.
A
australopithecines
B
Cro-Magnons
C
hominids in the genus Homo
D
Neanderthals
14) What is one important biological event that occurred during the Precambrian time?
A
life began
B
reptiles appeared
C
large mammals appeared
D
multicellular organisms appeared
*select an answer for all questions
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