Question

read the passage.
swamps and marshes are types of wetlands. they can be distinguished from each other by their location and by the types of vegetation they contain. while swamps are usually found near rivers, marshes form near lakes and ponds. they must both form in areas with poor surface drainage so that the soil stays wet. in the united states, most swamps are found around the great lakes and in the south. marshes are found all over the u.s.
swamps have trees and shrubs, while marshes contain reeds, grasses, and other plants with soft stems. swamps are named for the main type of tree that grows in them; for example, there are red maple swamps, cypress swamps, and hardwood swamps. marshes are distinguished from each other by their features as well. for example, some marshes contain saltwater, while others are freshwater.
what is the central idea of this passage?
○ the features and locations of swamps and marshes
○ the weather and climate of swamps and marshes
○ the types of swamps found in the united states
○ the vegetation found in swamps and marshes
identify the central idea of a passage

Explanation:

The passage compares swamps and marshes. It talks about their locations (swamps near rivers, marshes near lakes/ponds, their US distributions) and features (vegetation types, naming, salt/freshwater in marshes). The first option covers both location and features. The second option is incorrect as weather/climate isn't discussed. The third option only focuses on swamps in the US, not marshes. The fourth option only covers vegetation, but the passage also includes location. So the first option is correct.

Answer:

the features and locations of swamps and marshes