Which of the following is carried out by denitrifying bacteria? O A. break down large, nitrogen-rich molecules to simple molecules
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B. build large, nitrogen-rich molecules from simple molecules
O C. convert biologically useful nitrogen to gaseous nitrogen
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O D. convert gaseous nitrogen to biologically useful nitrogen

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Step 1 review the imaginary strand of dna below. note the complementary base pairs. a g c a a t c c g t c t t g g t c g t t a g g c a g a a c c step 2 to begin replicating this strand of dna, draw the two sides of the strand separating. step 3 now, draw the free-floating bases linking up with the separate sides. remember to follow the rules of complementary base pairing. step 4 draw the two resulting dna strands.