nitrogen
What will be an ideal response?
Nitrogen enters the living world via free-living and symbiotic bacteria, which incorporate nitrogen into their macromolecules through nitrogen fixation
Nitrogen fixation is eventually converted from organic nitrogen back into nitrogen gas by bacteria.
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The tube through which urine leaves the urinary bladder is the
a. collecting duct. b. urethra. c. renal pelvis. d. ureter. e. renal vein.
The loss of ventral spines by modern freshwater sticklebacks is due to natural selection operating on the phenotypic effects of Pitx1 gene _____
A) duplication (gain in number) B) elimination (loss) C) mutation (change) D) silencing (loss of expression)
One inanimate source of illness is fumes, which can gain access to the body through:
a. Skin B. Infection C. Inhalation and skin D. skin and digestive skin
All staphylococci can be differentiated from all streptococci because only staphylococci produce the enzyme _____ that is easily detected in the lab.
Fill in the blank(s) with the appropriate word(s).