Some unicellular organism like ameaba paramecium etc why not combine with each other and make a whole strucrure like us?

Dear Student, both amoeba and paramecium have structural and functionally different from each other and they cannot undergo reproduction as both are different organism. Both are microorganisms while we are human beings so microorganisms cannot give rise to us. Kindly revise concept diversity and hierarchy it will help you better understanding of the living world. Regards