Final answer:
The Constitution does not specify the number of justices and length of their terms, as well as the chief justice selection and impeachment process.
Step-by-step explanation:
The Constitution does not specify two aspects of the Supreme Court's structure and composition: the number of justices and length of their terms, and the chief justice selection and impeachment process. While the Constitution establishes the Supreme Court as the highest court in the land, it leaves Congress with the discretion to determine the specifics of the Court's structure and composition.