The element molybdenum is vital in the process of nitrogen fixation. For which crop would molybdenum be most critical to ensure success?
A) wheat B) apples C) cauliflower D) alfalfa
Answer: D
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Distances on a genetic map are measured in _____ units.
A. centromere B. DNA C. dalton D. centimorgan
What is the visible part of hair?
Why is there free oxygen in the air?
A. Organisms need oxygen to manufacture ATP. B. Free oxygen has been present since the formation of the earth's atmosphere. C. Evaporation of the oceans liberated oxygen. D. It is a by-product of photosynthesis. E. Free oxygen has seeped from cracks in the earth's crust.
If the competition coefficient ? is positive, that likely means
A) that the two species are strong competitors. B) that the two species are predator and prey. C) that the species are mutualistic. D) that only one of the species will survive.