Why does Muir believe that the water from the Hetch Hetchy Valley is not pure?
It is full of Iron
It is full of mud
It is full of sewage
It is full of chlonne

It is full of mud.

Explanation:

Hetch hetchy environment debates occurred between 1908 and 1913. Congress debated whether to make water resources available or preserve a wilderness when growing San Francisco city. Preservationist lead by John Muir argued that hetch hetchy valley should be protected from destruction and nature should be preserve for it's beauty, this is because the hetch hetchy valley is full of mud.

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.  

cause they were to dumb to get their college education to become a real   : )