Manipulative Studies
What will be an ideal response?
the researcher controls all the other variables in the experiment
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It is possible to make a form of nitrogen that is useable by plants; however, the major drawback to this process is
A. cost of converting nitrogen to a useable form. B. getting enough nitrogen. C. it is difficult to contain the end product. D. time involved. E. temperatures must be extremely high.
When pressure in the lungs falls below atmospheric pressure, ____
a. oxygen leaves the blood b. oxygen enters the blood c. air exits the lungs d. air flows into the lungs e. lung volume decreases
The relationship above is
a. a parasitic association. b. predation. c. resource partitioning. d. a mutualistic association essential to the fish but not the anemone. e. none of these.
Leeches belong to the phylum
a. Arthropoda. b. Mollusca. c. Annelida. d. Cnidaria.