Eras of life on earth
[DOC File]Use the geologic time scale to find the missing dates and ...
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So the relative order of the three youngest eras, first Paleoozoic, then Mesozoic, then Cenoozoic, is straightforward. Fossils are the recognizable remains, such as bones, shells, or leaves, or other evidence, such as tracks, burrows, or impressions, of past life on Earth. Scientists who study fossils are called . paleontologists. Remember that ...
[DOC File]Chapter 25
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Each era represents a distinct age in the history of Earth and life on Earth. The boundaries between eras correspond to times of mass extinction, when many forms of life disappeared. The oldest known fossils are 3.5-billion-year-old stromatolites, rocks composed of layers of cyanobacteria and sediment.
Notes on Diversity of Life, Fossils and Geologic Time
The eras of Earth history can be studied in light of conditions on Earth, the effect of those conditions on life-forms, and the possibilities of rapid changes to both (environmental conditions and life forms) due to catastrophes. eras are divided into periods. periods can be further divided into epochs
[DOC File]Making a Geologic Time Line
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Origin of the Earth. On the far right corner (as close to the edge as possible), place the word: Today. 6. Label the year and name of each era on your geologic time scale using the scale of roughly 6 cm = 1 billion years ago. HINT: Not all eras will be equal in size, as some have lasted longer than others. 7.
[DOC File]Test 1 - Early humans and the Neolithic Revolution
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15. Which of the following geologic changes most likely made the Earth’s climate better suited to grow plants? a. The creation of mountains. c. The increased friction among the tectonic plates that lead to a warmer climate. b. The end of the last ice age that lead to a warmer climate. d. all of the above. 16.
[DOC File]History of Life Webquest - MARRIC
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4. The biodiversity that exists on earth today is the result of _____. The easiest way to define evolution takes just three words: _____ _____ _____. Geologic Time is divided into four Eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic. Click on one of the images for a peek at life at the sea (Tour 2).
[DOC File]Geologic Time Webquest
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1. In order from oldest to present, what are the three eras of geologic time? 2. Which era do we live in? 3. When you were born, which era was it? (answers may vary) 4. During which era did the first fish develop? 5. During which era did the first humans develop? 6. Which era is known as the "Age of the Dinosaur?" 7. Which era is known as the ...
[DOC File]Geologic Eras - Miss Hamilton
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The earth can be divided into four main geologic eras. An era is a span of time in the earth’s history where significant geologic events occurred. The four eras are:
[DOCX File]Chapter 25: The Origin and Evolutionary History of Life on ...
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Earth’s early atmosphere (when life first appears in the fossil record) most likely consisted of CO 2, H 2 O, CO, H 2, N 2, and small amounts of NH 3, H 2 S, and CH 4 – note the lack of O 2, which is a major constituent of today’s atmosphere
[DOC File]Geologic Time
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781 About what percent of Earth’s 4.5 billion-year history is represented by Precambrian time? 88% 782 Why are the eons of Precambrian time not divided into numerous eras and periods? 783 One reason is that Precambrian life was soft-bodied and therefore the fossil record is meager compared to the Phanerozoic eon.
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