Madhu fell down while playing in the school playground and injured her knee. There was bleeding from the injured part but after some time a brown thick layer…

Madhu fell down while playing in the school playground and injured her knee. There was bleeding from the injured part but after some time a brown thick layer was formed on the injury to stop the bleeding.

(a) Name the solid structure labelled X that is formed on the injury.

(b) What is the enzyme that initiates the formation of X?

(c) Which mineral element is essential for the formation of X?