The ventral tube on the first abdominal segment of a springtail:

A. Chelate
B. Solution complex
C. Complex ion
D. All the above

A. NH nitrogen the NO3 nitrogen in soil
B. NO2 to NO3 nitrogen in soil
C. NO3 nitrogen to NH4 + in soil
D. None of the above

A. Mgº
B. Kº
C. NH2
D. Both b & c