The total amount of living material in an ecosystem is referred to as its ____
a. biomass
b. food web
c. secondary productivity
d. trophic total
e. succession
a
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The oldest well-documented stromatolites occur in the ____
A)Hadean B)Archean C)Paleoproterozoic D)Mesoproterozoic E)Neoproterozoic
According to the author:
a) technology shapes culture. b) culture shapes technology. c) Both a and b. d) Neither a nor b.
Hydrogen "burning" in stars is ________
A) an atomic reaction that generates hydrogen by splitting helium atoms B) hydrogen atoms that combine with deuterium atoms to make HD complexes, and this reaction generates immense amounts of energy. C) an atomic reaction that fuses 4 protons to make a helium nucleus, releasing energy by converting mass to energy D) a chemical reaction that bonds hydrogen to oxygen to make water, which remains a gas because of the extremely high temperatures
The Intergovernmental Panel on Climate Change's (IPCC) most recent assessment report in 2014 asserted what?
a) Earth's climate is changing, but there is no evidence that human emissions have any correlation with this change b) climate can be influenced by humans, but no significant changes in climate have happened in the past 50 years c) it is 95-100% certain that humans have been the dominant cause of significant climate change over the past 50 years d) human activities cannot cause climate change - climate change is caused by volcanoes and plate tectonics