Resiliency is the ability to withstand difficulties, so the answer is:
the ability of an ecosystem to recover from damage
The purpose of the author is to save the reefs! so:
to convince readers that practices that destroy coral reefs must be stopped
And the phrases that support safety are: more vitamin A (a crop was changed genetically to have more), "you can see" and "could help save" - those are part of the bigger argument
and finally, also unsubstantiated risks - this shows that there is no proof for the risks and "more nutritious"- it supports the value of the modified food
