Philosophy of Human and Alien

Suppose only one species between lovely dogs and humans can be kept on the earth, and humans must be kept, and then,

Suppose only one species between lovely dogs and dolphins can be kept on the earth, which one would you like to choose to be kept? And why?

Suppose human has mastered technologies and is able to create robots that can think like human, then what is the appropriate time for human to create them? What will the acceptable relationships be, in your eyes, between human and robot? And why?

Suppose there exist numerous alien civilizations in the universe, humans act just like worms in face of some alien civilizations, and some aliens act just like worms in face of the earth’s civilizations. What will the acceptable relationships be, in your eyes, between all civilizations? And why?

Suppose there comes some technology that can be used to make your consciousness copied into a robot or into your cloned body, and there will be two “you”s in this world (so you will feel no solitude at all), will you accept it or not? And why?