Scientists who study forms of marine life that lived more than200 million years ago usually obtain fossils not from the sea floor, butfrom areas that were once under sea and have been uplifted onto thecontinents. Why?

Scientists who study forms of marine life that lived more than200 million years ago usually obtain fossils not from the sea floor, butfrom areas that were once under sea and have been uplifted onto thecontinents. Why?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter18: Life's Origin And Early Evolution

Section: Chapter Questions

Problem 12SA: Which of the following was not present by the end of Precambrian? a. archaea c. fungi b. bacteria d....

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Question

Scientists who study forms of marine life that lived more than
200 million years ago usually obtain fossils not from the sea floor, but
from areas that were once under sea and have been uplifted onto the
continents. Why?

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The eon comprising the Cambrian period up to the present is called the (1). It is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Paleozoic era, first (2) appeared. Finally, the Cenozoic era is where (3), flourished, lasting up to this day.
The diversity of modern vertebrates was shaped in partby mass extinctions. The most severe extinction eventwe know of occured at the border between the Permianand Triassic periods about 250 million years ago. Anestimated 96 percent of the marine species and 70 percentof land species disappeared in what is sometimes called“The Great Dying.” The cause of this mass extinctionremains under investigation. Suggested causes includean asteroid impact, extreme volcanic activity, or a sudden release of carbon dioxide from deposits on the sea floor. Which groups of vertebrates were present when this mass extinction event occurred? Which evolvedafterward?
Why was it believed that life began in the seas and not in land or air? * Land and air were inhospitable places for life during the Hadean Eon. Land and air were inhospitable places for life during the Archean Eon. Land and air were inhospitable places for life during the Phanerozoic Eon. Land and air were inhospitable places for life during the Proterozoic Eon.
The coal that we use as crude oil to run cars and other machines is the product of incomplete decomposition of organisms from the Jurassic. Carboniferous. Permian. Triassic.
Which fossil layer is the oldest (name the geological period)?
What factors influenced the isotopic composition of oxygen in skeletons of marine organisms during the modern ice age?
Which fossil layer is the youngest (name the geological period)?
''Cambrian Explosion'' What contributed to this explosion of life? What were Earth conditions like and in what ways were the multicellular animals becoming different to those of the Ediacaran Period? Additionally, which form(s) of life were likely to be human ancestors during the Cambrian?
What biological materials are the most likely to fossilize?
Why would a rise in the availability of oxygen help explain why the Cambrian explosion occurred?
Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian period
All of the following have been suggested as triggers for the Cambrian radiation of complex metazoans except: perhaps the Cambrian metazoans outcompeted the Ediacaran metazoans, opening up new ecological niches to fill perhaps a series of fortuitsus genetic changes provided more raw material for natural selection to act upon perhaps increased oxygen in the world ocean promoted the evolution of complex body forms perhaps the rise in sea level that flooded the margins of the continents during the earliest Paleozoic created abundant new ecological niches, promoting biodiversity O perhaps the "arms race" between predator and prey spurred evolutionary innovation