I've checked all the options and I think that the right answer looks like this: Mollusks have highly developed olfactory receptors.
Answer:
B. Salinity
Explanation:
Salinity Definition: of, containing, or resembling common table salt; salty or saltlike
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Pyruvate is first converted to acetaldehyde by enzyme pyruvate decarboxylase in the presence of Thiamine pyrophosphate and Mg ++. Carbon-dioxide is released during this reaction.
Animals obtain nitrogen by eating plants which has absorbed nitrogen from the soil.
