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Explanation:
its either a) or b) i d k choose wisely please
Answer:
Lichens are not parasitic when they grow on trees, they just use the tree bark as a home. They enrich the soil by trapping water, dust and silt. When lichens die they contribute organic matter to the soil, improving the soil so that other plants can grow there.
I think the hormone would be testosterone, it would be subjectively deemed useless in times other than procreation. I would suggest that the important hormone is the growth hormone Thank you for your question.