Answer:
[The recent activities of fossil fuel combustion has had adverse effects on the ozone layer]- B.
<span>The gland which signals other glands to secrete hormones is the pituitary gland.</span>
Biotic factors of an ecosystem are all the living organisms that affect other organisms in an ecosystem and include animals, plants, microorganisms, dead organisms, and even animal waste. Example of biotic factors include: Grass as producers (autotrophs).
It’s the second one I believe:)
