something that may cause harm to people or to the
environment, especially a poisonous chemical
or an infectious disease
( option a : biohazard )
optio b : biogas )
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Answer:
biohazard
Explanation:
it is biohazard as biogas doesn't lead to any discomfort in the body of human or the environment which is made by the combination of both animal and plant kingdom, doesn't affect both animal and plant so its biohazard.
its kind a difficult to understand what I wrote so sorry about that.
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