Answer:
They are microorganisms that are important in the nitrogen cycle as converters of soil ammonia to nitrates, compounds usable by plants.
Explanation:
Answer:
D
Explanation:
Humans are considered to have intrinsic dignity that can't be violated and is even protected by laws of human rights. Therefore, even when conducting experiments that will involve human subjected, it is expected by ethical standards of research are considered before being implemented. For example it is important that the experiment does not subject humans to any form of embarrassment, bodily harm, and psychological harm.
B. toilet
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