The soil of an ecosystem determines the kinds of organisms that are able to live there. Which of the following soil characteristics can have an effect on the ecosystem of an area? A. the composition of the soil B. the particle size of the soil C. the texture of the soil D. all of the above

The composition of the soil definitely determines what kind of organisms can live there - it determines the kinds of nutrients that those organisms can receive.

The texture of the soil determines how easy it is for plants to retrieve the nutrients from the soil - so the correct answer is D. all of the above