What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon σ bond in ethyne? sp—sp s—s sp3—sp3 p—p sp2—sp2?

  The  two  atomic orbital or  hybrid  atomic  orbitals that overlap to form the carbon-carbon α  bond  in ethyne  is

SP- SP  atomic orbital

 Ethyne is  made up of two carbon atoms  where each  carbon atom is an SP  hybridized . In  ethyne  the   one sp orbital  of each   carbon atom  overlap to  each other  to form a  sigma bond (α). The remaining  Sp  orbital  overlap  with 1s from hydrogen to produce  two sigma bonds

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.