When so many oysters died off the coast of Britain that some native species were threatened with extinction, the fact...

amarachicynthia on April 22, 2021

Answer choice C

I did not understand what C meant. I thought it was irrelevant. Can you please explain?

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AndreaK on May 3, 2021

Hi @amarachicynthia,

Happy to help! What C is saying is that the chemical killed not only the native species of oyster, but also a separate imported species. Now that the waters are warmer, this imported species is flourishing "at the expense of" the native species in question. or in other words, taking over the ecosystem and making it harder for the native species to survive.

Hope this helps. Let me know if you have anymore questions!

Andrea