Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited. In other words, it is the gradual growth of an ecosystem over a longer period.
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Answer:
Rain
Explanation: Rain can wet the mud, and cause it to slide. This is one cause of a landslide that humans don't cause. This is why rain is a natural cause for lanslides.
In a cladogram the tiny indentations along the bottom line is an evolution or change and every organism after the indentation on the bottom line has it and every organism before the indentation does not
Answer:
Option 1 is the correct answer.
