I&C SCI 6B Lecture 21: 6B Week 7 Lec 3

systems development typically starts with a ____.

1. feasibility study, followed by a systems request, which includes a preliminary investigation
2. systems request, followed by a preliminary investigation, which includes a feasibility study
3. preliminary investigation, followed by a feasibility study, which includes a systems request
4. feasibility study, followed by a preliminary investigation, which includes a systems request

Which of these are the two major sources of nitrate pollution in rivers?

a. the burning of fossil fuels by factories and cars

b. animal wastes and the burning of fossil fuels by cars

c. animal wastes and fertilizers

d. fertilizer runoff and the burning of fossil fuels by cars

e. animal wastes and the burning of fossil fuels by factories