The table shows some information about two closely related species of sea bird.
Sewage pollution at the mouth of a river destroys its fish stocks.
What is likely to happen to local populations of these birds?
1 )
There will be no change to either species.
2 )
Species X numbers will decrease, species Y will remain constant.
Species Y numbers will decrease, species X will remain constant.
4 )
Both species numbers will increase.
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