How is it possible that the patient(s) could test positive for antibodies and negative antigens? ( There are 2 possibilities explain both)

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad

Which test would show positive results for orange juice