In order to prove that your cause-and-effect relationship exists, it is important to

In order to prove that your cause-and-effect relationship exists, it is important to include evidence to support your claim.

Explanation:

Whenever you present a cause-and-effect relationship or you claim the existence of it, it is necessary to have evidence to support your claim, if any information or idea can not be proved then it can not be subject of study since it will represent a false hypothesis, the to show an action that creates a reaction as true it is necessary to prove it.

usually, a falcon can kill an owl, and horses don't normally eat each other.

elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.