Question

1. Plankton is our planet’s most prolific life form, and the food it generates makes up the base layer of the global food chain. 2. The variety of shapes among plankton species shames plants on land, showing more range in size than the difference among moss and red wood trees. 3. There are more plankton cells in the sea than our current count of stars in the entire universe.

Q: Answer-1. Plankton is our planet’s most prolific life form, and the food it generates makes up the base lay...

Both 1 and 3 are correct, which makes C the right answer. 2 - replace the preposition AMONG with BETWEEN as the former is used when referring to more than two things, while the latter is used when referring to two things. Here, the sentence talks of two plant types - moss and redwood trees, so BETWEEN will be used.