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If Marine communities dominated during the Early Paleozoic, why move to land? What would an organism need to survive?
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- 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.In what way was the evolution of eukaryotic cells linked to the increase in the oxygen concentration in the atmosphere that occurred during the Precambrian?What do the banded formations in marine sediments indicate? A. Early cyanobacteria probably were producing oxygen when the sediment was deposited. B. The pH value of the early seas was quite low due to the excretion of organic acids from the fermentation by prokaryotes. C. Purple sulfur bacteria were the dominant life form in the seas during that time. D. The early atmosphere was very reducing
- Why would a rise in the availability of oxygen help explain why the Cambrian explosion occurred?Which of the following shows the correct sequence of periods in the Mesozoic era: a) Triassic, Jurassic, Cretaceous b) Cretaceous, Jurassic, Triassic c) Jurassic, Cretaceous, Triassic d) Triassic, Cretaceous, JurassicGeologic changes often accompany mass extinction of life forms. Why do you think this is true?
- Suppose you were told that mining deep-oceanmineral resources would mean severely degradingocean bottom habitats and life forms such as gianttubeworms and giant clams. Do you think that suchinformation should be used to prevent ocean bottommining? Explain.How do we know when oceans were first present on Earth?Why is the presence of oceans significant to the origins anddiversification of life?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.
- How did Paleozoic life diversify during the Ordovician, Silurian,Devonian, Carboniferous, and Permian periods?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.Discuss the Upper Paleolithic cultural period, including innovations in technology, art and burials. Why are the Upper Paleolithic cave paintings significant to the understanding of the Upper Paleolithic?