Determine the electron geometry, molecular geometry and polarity of N 20 (O central). eg=linear, mg=linear, nonpolar
eg=tetrahedral, mg=linear, nonpolar
eg=tetrahedral, mg=bent, polar
eg= linear, mg=linear, polar
eg=trigonal planar, mg=bent polar

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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