Final answer:
The exact number of assignments reviewing USHA in Domain 1 cannot be determined without further information about the curriculum structure or what USHA refers to.
Step-by-step explanation:
The question 'How many assignments in domain 1 review USHA?' seems to be requesting information about specific assignments related to a domain review, possibly within a course or curriculum. Since the provided context does not specifically mention USHA, it's unclear what USHA refers to, and it isn't possible to determine the exact number of assignments without additional information about the curriculum's structure.
However, looking at the instructions and context given, it appears there's an emphasis on the review questions, which suggests that assignments might be geared towards assessing understanding through these questions.