a fossil that is an imprint of an organism or its trace
mold
100
Which organisms can be found in the Precambrian fossil record? (a) bacteria (b) Fish (c) dinosaurs (d) mammals
(a) bacteria
100
The geologic time scale divides the earth's history into units of hundreds of years.
False. Millions of years
100
Fossils found in the top layer of undisturbed sedimentary rock are (a) youngest (b) oldest (c) heaviest (d) lightest
(a) youngest
200
chart that divides the earth's history into units of time
geologic time scale
200
when a fossil mold becomes filled
cast
200
The longest period in the geologic time scale is (a) Cenozoic era (b) Precambrian era (c) Mesozoic era (d) Paleozoic Era
(B) Precambrian Era
200
Evolution is the process of changing into a fossil
False. Changing over time
200
Parts of the organism that most likely will become fossils are (a) muscles (b) whole bodies (c) organs (d) hard parts
(d) hard parts
300
fossils in sedimentary rock that tell the history of the earth
fossil record
300
replacement of tissues by minerals forming a stone
petrified
300
the time in the earth's history from 570 to 250 million years ago, when many new life forms appeared and organisms first lived on land
(a) Paleozoic Era (b) Mesozoic Era (c) Cenozoic Era
(a) Paleozoic Era
300
Some scientists think a giant meteor may have led to the extinction of dinosaurs
True
300
The fossil record shows the earliest organisms were (a) complex (b) easily seen (c) simple (d) large
(c) simple
400
the age of a fossil or sedimentary rock layer as compared to other fossils or sedimentary rock layers
relative age
400
a fossil of known age used to determine the relative age of other fossils
index fossil
400
the time in the history of the earth, about 250 to 65 million years ago, during which reptiles were the major life form
(a) Paleozoic Era (b) Mesozoic Era (c) Cenozoic Era
(b) Mesozoic Era
400
A region of Precambrian rock near the earth's surface is called a shield
True
400
Which of the following is evidence for the hypothesis that a meteor caused dinosaurs to become extinct? (a) iridium in Mesozoic rocks (b) meteor pieces in dinosaur bones (c) dead plants with dinosaur bones
(a) iridium in Mesozoic rocks
500
a region of Precambrian rock
shield
500
fossils found in the lowest layer of sediment rock are (a) youngest (b) oldest (c) heaviest (d) lightest
(b) oldest
500
the time in the history of the earth, about 65 million years ago to the present, when recent life evolved on earth
(a) Paleozoic Era (b) Mesozoic Era (c) Cenozoic Era
(c) Cenozoic Era
500
The Paleozoic Era is considered the Age of Insects
False. The age of invertebrates
500
About 50 million years ago, horses were about the size of a (a) mouse (b) elephant (c) pony (d) cat