How do i know a molecule is polar or nonpolar? like amnoacids threonine and alanine?

⭐《ANSWER》

↪To know that a molecule is polar or non-polar

↪we will look that , does it contain the Electronegative elements that can create a partial positive or Negative charge, such as the HALOGENS

↪after this , also we can observe that , is there any amonia group or a carboxylic group that can create a positive or negative charge by transfer or acceptance of the Hydrogen atom

↪Also in case of the amino acids when the, acids are mixed in soluble solvent there is charge transfer , due to which there is formation of

〽ZWITTER ION

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.