Removal of will always result in the greatest changes in an ecological system. a) a keystone speciesb) a producer speciesc) a decomposer speciesd) a carnivore speciese) a competitive species

b. a producer species

Explanation:

Every trophic level is important, each level is reliant on the one below it for a food source. However, the producers are the base-line when it comes to food energy, providing food for prey, who thus provide food for predators. If the producer species in an ecosystem were to be removed, then the prey die off, thus the predators, causing a total collapse in the ecosystem.

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d they all are treatable but they never completely go away