What kind of clause is the clause in dark type?

why they feel so upset concerns their families.

a. adjective clause
b. adverb clause
c. noun clause
d. independent clause

What inference can be made about the characters beliefs

Whom does macbeth have murdered to keep one if the witches prophecies from coming true a. malcolm and donalbain b. king duncan c. the thane of cawdor d. banque and his son

What are the most plentiful organisms in an ecosystem