Competitive interactions are often diffuse, whereas mutualisms are not
Indicate whether the statement is true or false
FALSE
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The C4 cycle
a. replaces the carbon fixation stage of the Calvin cycle. b. supplements the activity of rubisco by providing a second source of 3PGA for the reduction stage of the Calvin cycle. c. is more efficient than the Calvin cycle because less ATP is consumed in the process. d. ensures that CO2 is provided to rubisco and thus prevents photorespiration. e. is most commonly associated with plants living in humid climates.
Which germ layer forms first? a. They all form at the same time
b. Mesoderm c. None of these choices. d. Endoderm e. Ectoderm
What was the probable source of gases
constituting the early atmosphere?
a. other planets orbiting the sun but close enough to the early earth b. meteorites c. volcanoes d. stromatolites e. comets
A gene in a sheep-like species has been found to differ from that in related species by the inclusion of a variable number of tandem repeats of a short sequence. These repeats or duplications arise from what process?
What will be an ideal response?