Which is an aspect of city life that might catch a human ecologist's attention?
1) The number of nannies that can be found in Central Park on a given day
2) The decision to make sidewalks narrower so that a city road can provide on-street parking
3) The number of male nannies that take care of children in New York City
4) The NIMBY movement to prevent a giant chain from opening near a high rise apartment building
