What percentage of our genetics do modern humans share with Neanderthals?
a. 56%
b. 3%
c. 99.5%
d. 75%
e. 96%
c
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The carbon cycle is closely linked to energy flow within an ecosystem because
a. carbon can be used as an energy source. b. all organisms are made of carbon compounds. c. carbon can form four covalent bonds. d. energy and carbon are both fixed into nutrient molecules by producers. e. carbon compounds can be both inorganic and organic.
The accumulation of free oxygen in the atmosphere
a. was a result of the accumulation of a by-product of a type of photosynthesis. b. prevented the further spontaneous generation of life. c. provided the opportunity to extract more energy through aerobic respiration. d. did not occur immediately after the earth was formed. e. did all of these.
Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon. Compared to water molecules, molecules of H2S will _____
A) have greater cohesion to other molecules of H2S B) have a greater tendency to form hydrogen bonds with each other C) have a higher capacity to absorb heat for the same change in temperature D) not form hydrogen bonds with each other
Which aquatic ecosystem is characterized by ocean tides and river flow stirring up nutrients and producing abundant life?
A) the pelagic zone B) the intertidal zone C) estuaries D) wetlands E) coral reefs