Which ecosystem is characterized by having both freshwater and saltwater, making it a crucial habitat for many species?

Which ecosystem is known for experiencing four distinct seasons, with trees that shed their leaves in the fall?

Which ecosystem is known for its salt water, covering about 71% of the Earth's surface, and is the largest habitat on the planet?

In which ecosystem would you find species that have adapted to live with very little water and extreme temperatures?

Which of the following organisms is a producer in an ecosystem?

What role do mushrooms play in an ecosystem?

Which organism is responsible for breaking down dead plants and animals, returning nutrients to the soil?

In an ecosystem, which of the following is an example of a secondary consumer?

What type of organism produces oxygen as a byproduct of photosynthesis?

How might the removal of a large number of trees from a forest affect the animals living there?

What could be a consequence of bees disappearing from an ecosystem?

If a large number of fish in a river are suddenly gone, what effect might this have on the ecosystem?

What might happen to a forest ecosystem if a new predator is introduced?

How might the addition of a large pond in a dry area affect the local ecosystem?

What might be the long-term impact on a river ecosystem if a large number of factories upstream start discharging pollutants into the river?

How could introducing earthworms into a garden ecosystem affect the soil and plants?