Make a ERD based on this DFD diagram

Physical DFD Diagram 0 Assign Student to class 1 Student List Add Student Information 1.1 Materials File Enrollment (Manual) Display Class Store Course Materials Student Information Typed into Computer 2 Course Materials Display Class Upload (Manual) Display Group Chat Materials File File For Display in Webpage Display Course Materials Display Groups Database Students Send Notification about New Materials -Send for Display Notify Lecturer New Group Notification Notification System New Message Sent Online Meeting Notification New Group Message Notify Online Meeting Notification 5 -Send Student's Materials Group Members Information Create Groups (Manual) Store Group Information 3 Groups Database Updated File From Cloud Send List of Group Members Collaboration Cloud Group Member Starts a Meeting 3rd Party Online Conference Room (Manual Group Members Accept Meeting Invitation 7 Data of Another Student and Message Content 4 Message Box Message System Sent Message Content Received Messages Display Message Process 7 Child Diagram Students List Name or Matric Number List of Students that Match Student Student Name or Matric No. Student 7.1 Search by Name or Matric No. 72 Open Chat Box Choose Specific Student to Send Message to Upload File(s) Upload Media Enter Text 73 7.4 7.5 Send a Text (Manual) Send Media (Manual) Send Files (Manual) Store Data Store Data Store Data 3rd Party - Display Messages 7.6 Forwarding Messages to Recipients Message Box -Forward Message Message Box Send Notification Notification System Physical DFD Diagram 0 Assign Student to class 1 Student List Add Student Information 1.1 Materials File Enrollment (Manual) Display Class Store Course Materials Student Information Typed into Computer 2 Course Materials Display Class Upload (Manual) Display Group Chat Materials File File For Display in Webpage Display Course Materials Display Groups Database Students Send Notification about New Materials -Send for Display Notify Lecturer New Group Notification Notification System New Message Sent Online Meeting Notification New Group Message Notify Online Meeting Notification 5 -Send Student's Materials Group Members Information Create Groups (Manual) Store Group Information 3 Groups Database Updated File From Cloud Send List of Group Members Collaboration Cloud Group Member Starts a Meeting 3rd Party Online Conference Room (Manual Group Members Accept Meeting Invitation 7 Data of Another Student and Message Content 4 Message Box Message System Sent Message Content Received Messages Display Message Process 7 Child Diagram Students List Name or Matric Number List of Students that Match Student Student Name or Matric No. Student 7.1 Search by Name or Matric No. 72 Open Chat Box Choose Specific Student to Send Message to Upload File(s) Upload Media Enter Text 73 7.4 7.5 Send a Text (Manual) Send Media (Manual) Send Files (Manual) Store Data Store Data Store Data 3rd Party - Display Messages 7.6 Forwarding Messages to Recipients Message Box -Forward Message Message Box Send Notification Notification System