There have been five mass extinctions in the last 450 million years. What are some of the possible cataclysmic events that lead to these mass extinctions?
?Scientists are not always certain of the cause of causes of each mass extinction, but leading candidates for a couple of these events include the collision of an asteroid or comet with Earth, or massive volcanism leading to rapid climate change. Other potential contributing factors or mass extinctions may include the breakup, collision, or rearrangement of continents, changing currents patterns, or even large-scale oceanic anoxic events.
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____________________ are the remains or traces of once-living organisms Fill in the blank(s) with the appropriate word(s)
Sheet-joint-bounded slabs of rock slip or slide off the parent rock, leaving large, rounded masses known as ____________________
Fill in the blank(s) with correct word
After the eruption of Mount St. Helens, Spokane, Washington,
A) saw its diurnal temperature cycle flatten out. B) saw its daytime temperatures increase sharply. C) saw its nighttime temperatures decrease sharply. D) saw a marked decrease in its outgoing amount of terrestrial radiation. E) did not have any significant changes in temperature.
select all of the statement that are true concerning the ecological significance of prokaryotes
a. Bacteria and archaea are an important food source for other organisms. b. Without prokaryotes, nitrogen wouldn't be made available to other organisms to use in DNA or protein synthesis. c. Some species of bacteria cause the disease malaria. d. Resident bacteria living in and on humans crowd out disease-causing bacteria. e. Bacteria help us produce cheese. f. Archaea are important agents of disease in humans.