Question

in this type of ecological succession, an ecosystem once existed, but was destroyed.
primary succession
secondary succession
first succession
second succcession

Explanation:

The description specifies ecological succession where an existing ecosystem was destroyed, which matches the definition of secondary succession (recovery of an area that previously had established life, unlike primary succession which starts on barren, uninhabited land). The option "First Succession" is not a standard term, and the green option has a typo.

Answer:

◆ Secondary succession