An example of a parallel choice on a dichotomous key is happy or sad and old or young. Either one of those answers.
False; Agriculture can negatively impact the environment when fertilizer enters the water, contaminating it. Agriculture can also lead to deforestation, the lack of trees will lead to erosion.
Magnetic- A non contact force that is generated between charged objects
Electrical- A non contact force that is generated between moving charges
Gravitational- A non contact force that exists between objects with mass
Contact- A force that requires physical contact between objects
i believe this are correct :)