Question

the bold word is a \middle swabi\ (subordinating conjunction). does the highlighted comma belong?
leonardo likes running by the river, because the scenery is beautiful.
keep the comma
remove the comma

Explanation:

A comma before "because" is only used when the independent clause before it expresses a contrast or the dependent clause is non-essential. Here, the dependent clause "because the scenery is beautiful" directly explains why Leonardo likes running by the river, so no comma is needed.

Answer:

Remove the Comma