Natural disturbances such as volcanic eruptions and human activities such as cutting down forests create changes in ecosystems. Ecosystems recover through a series of changes over time called succession. Which is an example of primary succession? Grasses take over an abandoned cornfield. Small shrubs sprout in a forest burned by a wildfire A pond fills in as more and more plants grow along its edges Lichens and mosses grow on rocks exposed by a melted glacier

## Step 1<br />Primary succession refers to the process of ecosystem recovery in an area where no soil or organisms exist. This usually happens in areas where there has been no life before, such as on a new volcanic island or on rocks exposed by a retreating glacier. <br /><br />## Step 2<br />In contrast, secondary succession occurs in areas where an ecosystem has previously existed but has been disturbed or destroyed. This could be due to events such as fires, floods, or human activities like deforestation. <br /><br />## Step 3<br />In the given options, the scenario where lichens and mosses grow on rocks exposed by a melted glacier is an example of primary succession. This is because the rocks were previously devoid of life, and the growth of lichens and mosses is the first step in creating a new ecosystem.