Answer is: a secretary smokes a cigarette in a crowded break room.
External cost Is when consuming a good or servise imposes a cost to a third party. In this case, smoking affects other people in break room, causing pollution and health related problems.
No you would not be using energy from the sunlight because you don't get energy to walk, run, etc. from the sun. The closest type of energy to walking a dog is kentic energy.
The red flowers would have to have a dominant trait over the recessive white flowers <span />
