A single-interest group is a group that is trying to push forward legislation and momentum around, well, a single-issue.
This might mean gun-control or reproductive rights.
They might have candidates in one party that they prefer but they are broadly trying to convince ALL candidates to believe what they believe.
So, B is the correct answer.
Self-centered people can be empathic.There's no one reason why people get depressed
In order for the student to be able to properly test the hypothesis, it will be needed that certain data is collected first. The student will have to take the most important things in consideration about the creosote bush, like would it be able to survive under shade (much limited sunlight), would it be able to sustain increased amount of moisture (the solar panels will keep some of the moisture below them), but also being exposed under high temperature. The conditions for the creosote bush will change significantly, so these three things will be of crucial importance to be tested, since it is a very specialized plant, and those types of plants usually react very badly on sudden changes.