Which of the following can carry out denitrification to completion?
A. Nostoc
B. Nitrobacter
C. Azotobacter
D. Rhizobium
E. Pseudomonas
Answer: E
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a. True b. False
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____________________ Indicate whether the statement is true or false.
A controlled experiment is one in which ________
A) there are at least two groups, one differing from the other by two or more variables B) the experiment is repeated many times to ensure that the results are accurate C) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data D) there are at least two groups, one of which does not receive the experimental treatment