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Tasya [4]
3 years ago
10

Which is a role of helpful bacteria.

Biology
2 answers:
sergiy2304 [10]3 years ago
8 0

Answer:

The answer is B producing oxygen

Explanation:

dezoksy [38]3 years ago
5 0

Answer:

your right it is b

Explanation:

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Allergic responses to inhaled antigens occur when an individual is first sensitized to the antigen (i.e., the allergen), inducin
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olution's patterns manifest as nested similarities. nesting occurs between molecular sequences of evolutionarily related organis
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