Researchers have found a between certain types of social media use and depressed moods. * 1. correlation
2. causation

1. Correlation

Explanation:

The word "correlation" means a connection, link, or a mutual relationship between two or more entities. In this case, the entities are the "types of social media use" and "depressed moods".

In other words, the sentence describes that researchers have found a connection or dependence between the types of social media use and depressed moods.

Causation is another word on its own which does not fit into the sentence correctly to give the sentence the intended meaning. It is the act of causing something.

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explanation: