Respuesta :
The study of nature is called environment is called ecology. There are two types of components in ecology and these are biotic and abiotic factors.
The correct answer is a volcano.
What are volcanos?
The mountains have a hole or pit in between which is filled with lava.
According to the question, One natural cause of extinction would be the massive volcanos that occurred in the 1800s.
For more information about the volcanos, refer to the link;-
https://brainly.in/question/9531558
