@jacoballens ”なぜなら” is not the word instead of "から". only "から", it is enough.
When my friend asks me "なんでその映画が好き？", I answer "面白いから." I don't say "なぜなら、面白いから." Then I omit "なぜなら." Because there is "から", we know it is the sentence of "because ...." It is very natural when we talk with friends. (I see "cause, ...." instead of "because ...." in English. like that?)
In a meeting, a presentation, or math class, we use the word "なぜなら." or when I want to say a little strongly.
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