18.Fertilizers and pesticides applied to farm fields in Pennsylvania have made their way down into the Chesapeake Bay in Maryland. This is an example of _________________ pollution.
19.Before beginning any land development project, people should carry out a(n) ___________________ analysis to consider all of the potential impacts of the project on the local ecosystems.
20.If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support.
21.To conserve materials and energy, it is best to recycle as much solid waste as possible. Recycling slows the rate of waste going into ______________.
22.Disturbance of an ecosystem by human activity often has negative effects on the number of species, which is a measure of its __________________.