Is appellant's contention that there is insufficient evidence to support his claim of innocence on appeal cognizable on appeal?

As a preliminary matter, respondent argues appellant's contention is not cognizable on appeal because, "[b]y admitting responsibility, appellant admitted that he committed the acts with the requisite mental state to justify the juvenile court's finding. Consequently, he may not claim on appeal that there was insufficient evidence that he knew the wrongfulness of his acts." According to respondent, any lack of evidence in the record resulted from appellant's decision to admit that he committed the offense and, moreover, his admission was the equivalent of a guilty plea, which precludes appellate consideration of issues related to guilt or innocence. (See, e.g., People v. Palmer (2013) 58 Cal.4th 110, 114.)