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Question
A major obstacle the first land plants had to overcome was ________.A) finding food on land where there were no organic compounds
B) staying upright despite gravity and wind on land
C) their lack of mobility because they needed water access
D) the large number of plant eating organisms on land
E) eliminating waste materials in the atmosphere
Answer
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Related questions
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A) coal
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C) helium gas
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A) reserve
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A) luster
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What does the tendency of micas to produce thin cleavage flakes suggest about its crystal structure?
A) The crystal structure is characterized by complex polymerized mats that form a sheetlike structure.
B) The structure is characterized by rings that form an interlocking network, forming planar sheets.
C) The structure is produced by flow in the igneous rock, aligning glass layers within the crystal structure.
D) The atoms are arranged in orderly arrangements that form strongly bonded sheets separated by weak bonds between the sheets.
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Use the Periodic table below to answer the following questions: When electrons are shared amongst all atoms, the resulting bond is a(n) ________ bond.
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Use the Periodic table below to answer the following questions: Element 20, Ca, has what chemical property?
A) It behaves as a metal ion, giving up two electrons to form a +2 ion.
B) It tends to form covalent bonds and an ion with a charge of +1.
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D) It tends to be inert, and thus is dispersed throughout the crust.
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B) innermost electron shell because the electrons can be transferred to the nucleus
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D) Any electron can exchange with adjacent atoms to form a bond; there is no preference.
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B) heat from Earth's interior
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A) deep-ocean trenches
B) oceanic ridges
C) seamounts
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C) flat river valleys that cut through older mountain ranges
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A) along coastlines
B) near desert regions
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A) viscosity
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A) subduction
B) sea floor spreading
C) back-arc contraction
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B) Asthenosphere
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A) hot spots on the sea floor, like Iceland
B) spreading ridges
C) convergent plate margins
D) transform plate margins