Predominant....
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Predominate
1.
be the strongest or main element; be greater in number or amount.
“small-scale producers predominate in the south”
synonyms: be in the majority, preponderate, be predominant, prevail, be most prominent
Looks like either or........
If I understand correctly, you were using "predominate" as an adjective to describe (or modify) the word "It" -- and the correct adjective form is "predominant".
The word "predominate" is not an adjective; it is a verb (an action word), as in, "Blacks predominate in American professional sports teams." In that sentence, "professional" and "sports" are adjectives. In the sentence "He sports a new ball cap every year," "sports" is a verb.