Alan made a study on two types of habitats and recorded his observations in the table below. A tick (✔︎) indicates that the observation is seen.

ObservationsHabitat AHabitat B
Pesticides are used on plants✔︎
Butterflies are flying in this area✔︎
Dragonfly nymphs are found at the bottom of the water✔︎
Floating plants are found at the surface of the water✔︎

Which of the following do habitats A and B represent?