If two events are correlated, what must be true?(1 point) One event caused the other. Both events have the same result. Both events have the same cause. The events tend to happen together

One event caused the other  

Explanation:

A correlation refers to how related are two or more variables among each other.

Two events are correlated if the result of one of them depends on the result of the other event. Also, the probability of one of them happening will be conditioned by the occurrence of the other event.  

There are different types of correlation. When two correlated variables or events have a causal relation, this means that one of them occurred because the other one occurred first. For example, let us think about a dolphin cranium. We might measure two variables, the rostrum length and the skull length. The longer the rostrum is, the longer the skull will be. The occurrence of a longer rostrum implies a longer skull. This two events are positively correlated.    

Although not every correlated event is due to causality, whenever causality occurs between two variables, it means that they are correlated.    

b because they naturally adapt to their environment plz mark brainliest

explanation:

"d.) carbon dioxide and hydrogen sulfide"