a) In this movie, we found the following topics:

- The alien existence in any other planet.
- The power to accept the differences of others.
- A universal problem such as a war between 2 worlds.
- Shows the point of the human indolence about the alien fraternal links.

b) We choose the topic of the alien existence in any other planet:

Human thought that they were alone in the universe until there started to happen strange things in the earth, which suggested them the alien existence. After that, they wanted to stablish a communication between the both races.

This is very important, because if there were any alien civilization, we could exchange cultural knowledge. Therefore we could evolve, and for example, we could find the cure for some diseases such as the cancer... or we could design some technologic engines too. Maybe with their technologic knowledge, we could find how to repair the ozone layer.

Some bad consecuences could be (as the movie showed) the medic experiments whith the alien individuals. This things happen because of the human ambition, human always try to know everything without regarding the consecuences.

This topic is also related with the respect of the neighbors' dignity. In our whole history, human always thought that they were the only specie that had a soul, so they don't care about the integrity of the other species.

We conclude that maybe we are not alone in the universe. If we find any alien lifeform it could mean a new human age, which could help us with many difficult problems. But the most important thing is to respect other lifeforms, because they have a soul such as he have.