Which of the following extinctions was due solely to asteroid impact? Devonian Ordovician-Silurian Cretaceous Permian

## Step 1<br />The question asks us to identify which of the given extinctions was solely due to an asteroid impact. The options provided are Devonian, Ordovician-Silurian, Cretaceous, and Permian.<br /><br />## Step 2<br />The Cretaceous extinction, also known as the K-T or K-Pg extinction, is widely accepted to have been caused by an asteroid impact. This event occurred approximately 66 million years ago and led to the extinction of the dinosaurs.<br /><br />## Step 3<br />The other options, Devonian, Ordovician-Silurian, and Permian, were not caused by an asteroid impact. The Devonian extinction was due to climate change, the Ordovician-Silurian extinction was due to glaciation, and the Permian extinction was due to volcanic eruptions.