Its known as a Complex sentence.
I believe the answer is Adjective Clause because some signal words that give away that it could be an Adjective Clause is THAT, Which, Who, Whom, and Whose. And the word "That" is part of the underlined section, correct?
The first choice is correct
Earth is the only planet in the solar system were living organisms are found. Not only that earth also consists of air,water,soil and land which are the most important elements for living organisms to survive. The temperature of earth is also favourable for living.As a whole living is possible in the earth so it is different from other planets in solar system.
(1). a (2). b (3). a (4).a (5).b (6).b i hope i helped
