What was Gondwanaland? supercontinent during Permian southern portion of supercontinent northern section of supercontinent mass extinction at end of Cenozoic Era Multiple Choice 1 point Which was the largest mass extinction in Earth's history? Precambrian extinction Jurassic extinction Ordovician extinction

## Step 1<br />The first question asks about Gondwanaland. Gondwanaland, also known as Gondwana, was a supercontinent that existed from the Neoproterozoic (about 550 million years ago) until the Jurassic (about 180 million years ago). It was not a supercontinent during the Permian, nor was it the northern section of a supercontinent. It was the southern portion of a supercontinent, which is why option B is the correct answer.<br /><br />## Step 2<br />The second question asks about the largest mass extinction in Earth's history. The largest mass extinction in Earth's history is the Permian-Triassic extinction event, also known as the Great Dying, which occurred approximately 252 million years ago. This event wiped out about 96% of all marine species and 70% of terrestrial vertebrate species. The Precambrian extinction, Jurassic extinction, and Ordovician extinction were significant but not as extensive as the Permian-Triassic extinction. Therefore, option A is the correct answer.