Identify the underlined portions in the following sentences as either independent or subordinate clauses. 1. many people use bamboo screens that roll up and down.
a. subordinate
b. independent 2. bamboo is the fastest growing plant that we know.
a. subordinate
b. independent

The sentences given do not have the underlined parts.
Anyway, when we say independent clause, this is the clause that conveys a complete thought. It consists of the subject and the predicate. In other words, it is a simple sentence. On the other hand, a dependent clause is a clause that do not convey a complete idea. It needs the independent clause to make it understandable. Here are the answers:
1. Many people use bamboo screens : INDEPENDENT
    that roll up and down : DEPENDENT
2. Bamboo is the fastest growing plant : INDEPENDENT
    that we know : DEPENDENT

The answer would be b .

I've actually never heard of the guy. but, atleast he doesn’t rap/sing about drugs and girls, but he still have a very high view of himself, which could possibly cause annoyance