The ability of an ecosystem to return to its equilibrium state after an environmental disturbance is called
resistance
restoration
reformation
resilience

The correct answer is D. Resilience.

Explanation

Ecological resilience is a term used to refer to the resistance of natural ecosystems to external disturbances such as human intervention or natural catastrophes such as hurricanes, earthquakes, tornadoes, among others. The resilience of an ecosystem is influenced by its diversity and complexity so that the more complex it is and the more diversity of species it will have a better recovery after a disturbance. So, the correct answer is D. Resilience.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.