Invasive species often unbalance the ecosystems into which they are introduced because
a. they did not co-evolve with the natural species and lack natural controls, like predators
b. they breed quickly and have the potential to overpopulate an area
c. they consume local resources
d. none of the above

The correct answer is option A

Invasive species can be defined the species that are introduced intentionally or unintentionally in an environment.

These species might adopt the environment in which they are placed or might not get involved in the environment.

Invasive species often unbalance in the ecosystem because they did not co-evolve and fit into the ecosystem as they are not controlled by the natural control like predators.

This creates ecological imbalance.

every el niño cycle is different. every year.

but there is no

i guess you forgot putting it.