Answer: d. assimilating the nitrogen into their own biomolecules.
Explanation: I just had this question for an assignment.
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The primary hormones involved in the functioning of the male reproductive system are follicle stimulating hormone (FSH),Luteinizing hormone (LH) and Testosterone.
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Horses sleep while standing, unless it is necessary for them to get REM sleep. The amount of REM sleep needed is not much, so they will spend most of their time when sleeping, standing.
I'd say probably Biomass, not 100% sure but it's renewable, but it can create power and heat.