Question

read this paragraph.
rocky mountain national park, nicknamed
ocky,\ is a true marvel of the american west. visit this place set aside for its natural beauty and you will encounter a variety of animals, plant life, and even climates. there are four ecosystems inside rocky mountain national park: riparian, montane, subalpine, and alpine tundra. you might see a moose or mule deer drinking from a pond in a riparian ecosystem, which are areas that are near streams or lakes. riparian ecosystems can be found within the other three ecosystems. the montane ecosystem is the lowest in elevation at rocky. there you will find ponderosa pine trees and wide - open mountain meadows, lush with wildflowers in the summer. climb a little higher into the subalpine ecosystem, where long winters and short, cool summers make up the climate. look high into a limber pine tree and you might spot a clarks nutcracker, nibbling on pine seeds. finally, the highest elevation in rocky is the alpine tundra. bitter cold and wind - blasted defines this ecosystem with its jagged mountain tops that are capped with snow even in late august. each of these ecosystems has a quality all its own, but they are all interconnected, comprising a true american treasure:
ocky.\
which of these best states the main idea?
○ the riparian ecosystem can be found within the other three ecosystems.
○ there are four ecosystems inside rocky mountain national park: riparian, montane, subalpine, and alpine tundra.
○ each of these ecosystems has a quality all its own, but they are all interconnected, comprising a true american treasure:
ocky.\
○ rocky mountain national park, nicknamed
ocky,\ is a true marvel of the american west.

Explanation:

To determine the main idea, we analyze each option:

• Option 1: The paragraph does not state that the riparian ecosystem is within the other three; it describes four distinct ecosystems (riparian, montane, subalpine, alpine tundra) with their own features. So this is incorrect.
• Option 2: The paragraph lists four ecosystems (riparian, montane, subalpine, alpine tundra) inside Rocky Mountain National Park, which matches this option.
• Option 3: While the paragraph mentions ecosystems are interconnected, the main focus is on describing the park's ecosystems and its status as a treasure, not just the interconnection. This option is not the main idea.
• Option 4: This option focuses on the park's nickname and being a marvel, but the paragraph spends most of its content describing the ecosystems within the park, so this is not the main idea.

Answer:

The option "There are four ecosystems inside Rocky Mountain National Park: riparian, montane, subalpine, and alpine tundra." (the third option in the list of choices, considering the order: first option is about riparian within others, second is the four ecosystems, third is about ecosystems' quality and interconnection, fourth is about the park's nickname and marvel status. Wait, re - checking the options:

Looking at the options as presented:

1. The riparian ecosystem can be found within the other three ecosystems.

1. There are four ecosystems inside Rocky Mountain National Park: riparian, montane, subalpine, and alpine tundra.

1. Each of these ecosystems has a quality all its own, but they are all interconnected, comprising a true American treasure: "Rocky."

1. Rocky Mountain National Park, nicknamed "Rocky," is a true marvel of the American West.

The correct option is the second one: 2. There are four ecosystems inside Rocky Mountain National Park: riparian, montane, subalpine, and alpine tundra.