Question

this image shows a pileated woodpecker that is native to the united states. which of these will cause a cascading effect or trophic cascade in an ecosystem? the loss of any one species in an ecosystem no change in any factors in a thriving ecosystem the gain of a new species in an ecosystem

Explanation:

A trophic cascade is often triggered by the removal of a key - species (which can be a top - predator or a keystone species). The loss of any species can disrupt the food web and cause a cascading effect on other species in the ecosystem. No change in factors won't cause a trophic cascade, and the gain of a new species may not always lead to a trophic cascade as compared to species loss.

Answer:

the loss of any one species in an ecosystem