- A drought occurs over a period of months / years
- Drought is when available water decreases in an environment
- So, drought is when available water decreases in an environment over a period of months / years

- Drought is when available water decreases in an environment over a period of months / years
- As available water decreases , the population of plants will decrease
- So, a drought that occurs over a period of months / years may cause the population of plants in an environment to decrease

- A drought that occurs over a period of months / years may cause the population of plants in an environment to decrease
- A marsh willow herb is a kind of plant
- Therefore, a drought that occurs over a period of months / years may cause the population of marsh willow herb in an environment to decrease

So, a drought that occurs over a period of months / years may cause the population of marsh willow herb in an environment to decrease
[Question]The marsh willow herb is a plant native to the northeastern United States. It grows best in damp habitats. Which of the following environmental changes would most likely cause a decrease in the marsh willow herb population in an area?
[Context]- A drought occurs over a period of months / years 
- A marsh willow herb is a kind of plant 
- Drought is when available water decreases in an environment 
- As available water decreases , the population of plants will decrease