The answer is occluded front
Just listen to your teach and do good in class and score
<span>The largest mass extinction in Earth's history, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic to recover.[1] Recovery of life in the sea may have been much faster." </span>
Answer:
cutting down of tress also known as shifting cultivation
