Species interactions between members of a community include __________, which is helpful to one
species and does not harm the other species. Fill in the blank(s) with the appropriate word(s).
commensalism
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Which of the following factors may have favored the evolution of simple multicellularity?
A. All of these options are factors that may have influenced the evolution of simple multicellularity. B. increased ability to avoid predation C. increased ability to maintain a position in the water column D. increased ability to remain in a location that is favorable for growth E. increased ability to generate water currents for feeding
The two arms of adaptive immunity work together as follows:
a. ____-mediated responses target antigen in blood or interstitial fluid and involve ____ cells. b. ____-mediated responses target intracellular pathogens or altered body cells and involve ____ cells and ____ cells.
During respiration most ATP is formed as a direct result of the net movement of
A. Potassium against a concentration gradient B. protons down a concentration gradient C. electrons against a concentration gradient D. electrons through a channel E. sodium ions into the cells
Members of the Domain Bacteria and Domain Archaea differ in that
A. Archaea are larger than Bacteria. B. Archaea reproduce sexually and Bacteria do not. C. Archaea are mostly parasitic. D. Archaea have a more complex nature to their DNA than do Bacteria.