Answer:
A) Biotic
Explanation:
It's definitely not abiotic and nonliving because they are living and who would categorized 'excretions of living organism' "living".
We have that the the excretions of living organisms are best categorized as Biotic.
Living and non living consider strictly Creatures with life in them or not
Generally, Biotic substance is a substance that is living or emanating as a result of the direct actions of a living organism.
Where,Abiotic is the vice verse.
Therefore, the excretions of living organisms are best categorized as Biotic.
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