Gene flow between organisms of ring species occurs
a. between any of the organisms if they are placed in the same environment.
b. freely.
c. never.
d. only between intermediary populations.
e. only under laboratory conditions.
D
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What do photosynthetic organisms often supply to their nonphotosynthetic partners in a mutalistic relationship?
a. sugars through nectar, fruit, etc. b. protection c. a place to live d. a place to reproduce e. essential minerals
The oxygen transporting pigment found in the system depicted in the accompanying figure is most likely:a
hemoglobin. b. hemolymph. c. hemocyanin. d. globulin. e. erythropoietin
Which of the following statements concerning tumor necrosis factors (TNF) is FALSE?
a. TNF can be secreted by macrophages. b. TNF may stimulate the inflammatory response. c. The release of large amounts of TNF brings down a high fever. d. TNF kills cancer cells. e. TNF can be secreted by lymphocytes.
Life history adaptations of ________ populations are characterized by an early age of first reproduction and short maturation time and life span.
A. K-selected B. r-selected