I'm still a university student and not a teacher yet. In the U.S.A., what are the differences between mild/moderate v.s. moderate-severe special education? Other than deaf-blindness, what are some examples of moderate-severe disabilities students may have while having an IQ in at least the borderline to average range (I do understand that some students with mild-moderate and moderate-severe disabilities may have mild to severe intellectual disabilities (seems like students with severe intellectual disabilities would be considered to have moderate-severe disabilities from what I've read), whether or not coexisting with another disability)? Would a mild-moderate or moderate-severe educational specialist credential authorize a teacher to teach students with physical disabilities, visual impairment, traumatic brain injury, autism spectrum disorder or speech/language disabilities? Would students with emotional disturbance who are receiving special education services typically be considered to have a mild-moderate disability or a moderate-severe disability?