Exponential growth is a type of growth that increase in quantity over time.
When a population migrate to a new habitat it shows exponential growth because in the beginning, the growth rate is slow as population adapts the new environment and once they evolve according to the environment, they will grow exponentially.
Hence, the correct answer is "Exponential growth".
because the ecosystems are not adopted to this type of animals thus the invasive species will have the upper hand and will spread to the native animals disadvantage