The aerated upper layer of soil is likely to have ________ concentrations of H2 for aerobic H2-oxidizing Bacteria, so these bacteria likely ________.
A. high / thrive in such conditions by not competing with chemoorganotrophs
B. high / generate important reducing equivalents as byproducts for other microorganisms in the soil
C. low / do not occur in such habitats
D. low / will need a chemoorganotrophic way to grow as well
Answer:D
The aerated upper layer of soil is likely to have ________ concentrations of H2 for aerobic H2-oxidizing Bacteria, so these bacteria likely ________.
A. high / thrive in such conditions by not competing with chemoorganotrophs B. high / generate important reducing equivalents as byproducts for other microorganisms in the soil C. low / do not occur in such habitats D. low / will need a chemoorganotrophic way to grow as well