In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct

1. Marine biology is the study of organisms in the ocean.

P. At a fundamental level, marine life helps determine the very nature of our planet.

Q. Marine life is a vast resource.

R. Shorelines are also shaped and protected by marine life.

S. Marine organisms contribute significantly to the oxygen cycle.

6. Marine biology covers a great deal, from the microscopic to the huge whales.