Directions: Select each correct answer. More than one answer may be correct.

Question

The organisms within an established ecosystem interact and form relationships with each other over time. This interdependence allows ecosystems to remain relatively stable for hundreds and sometimes thousands of years

Which of the following would likely decrease the population size of an established plant species?

a sudden change in climate

an increase in available nutrients

an extended drought

introduction of a non-native species

Answer 1

The following factors would likely decrease the population size of an established plant species:

1. a sudden change in climate - This can disrupt the growing conditions for plants, leading to a decline in their population if they are unable to adapt quickly enough.

2. an extended drought - Prolonged periods without sufficient water can severely affect plant health and growth, leading to a decrease in their population size.

3. introduction of a non-native species - Non-native species can compete with established plants for resources such as water, light, and nutrients, potentially leading to a decline in the population of the native plant species.

Therefore, the correct answers are:

• a sudden change in climate
• an extended drought
• introduction of a non-native species