I went drowning ER diagram for this entities

Entities:

$-$ Student

Attributes: StudentID $($PK$),$ Name, Age, Gender, GPA

$-$ Course

Attributes: CourseID $($PK$),$ Title, Credits, Department, Professor

$-$ Department

Attributes: DeptID $($PK$),$ Name, Location, Chairperson

$-$ Professor

Attributes: ProfID $($PK$),$ Name, Department, Rank, Office

$-$ Enrollment

Attributes: EnrollmentID $($PK$),$ StudentID $($FK$),$ CourseID $($FK$),$ EnrollmentDateRelationships:

$-$ Student and Enrollment $($Many$-$to$-$Many$)$

$-$ Course and Enrollment $($Many$-$to$-$Many$)$

$-$ Department and Course $($One$-$to$-$Many$)$

$-$ Professor and Course $($One$-$to$-$Many$)$

Cardinality Ratios:

$-$ Student to Enrollment:

Many$-$to$-$Many

$-$ Course to Enrollment: Many$-$to$-$Many

$-$ Department to Course: One$-$to$-$Many

$-$ Professor to Course: One$-$to$-$Many

Total Participation & Partial Participation:

$-$ Total Participation:

$-$ Every course must be associated with a department.

$-$ Every enrollment must be associated with a student and a course.

$-$ Partial Participation:

$-$ Not every student needs to be enrolled, and not every course needs to have enrollments.