Has Stephen Curry Officially Ended His Basketball Career?

Today my friend asked me if you can use has instead of have here. I am wondering if the following sentence is correct.

Stephen Curry Graduates College 13 Years After Leaving For NBA

Has Stephen Curry Officially Ended His Basketball Career?. I am wondering if the following sentence is correct. I have read a similar question here but that one talks about the usage of has/have with reference to anyone. Since there is no other.

There Are 200 Individuals Who Each Have Two Alleles At Single Nucleotide Site Of Interest.

Can anyone explain me in a simple way? Since there is no other. I am wondering if the following sentence is correct.

Here, I Wish To Ask A.

Can anyone tell me where we have to use has and where we have to use have? Today my friend asked me if you can use has instead of have here. I have read a similar question here but that one talks about the usage of has/have with reference to anyone.

I'm Not Sure How To Explain The Grammar Simply.

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