For this case we have the following expression:
Los deportes _________ se hacen en el agua.
What we should do is fill in the blank with the correct definition.
By definition we have:
Water sports: Are those sports that are practiced in the water, such as swimming, water polo, among others.
Therefore, the correct sentence in Spanish that meets this definition is:
Los deportes acuáticos se hacen en el agua.
Note:
Deportes acuáticos = water sports
Answer:
"acuáticos"
Los deportes acuáticos se hacen en el agua.