The Palaeozoic era starts at ____ million years ago and ends at ____ million years ago.

The correct answer is: B. 570, 225

The Paleozoic Era is the first of three geologic eras of the Phanerozoic eon, spanning 541 to 252 million years ago. It is the longest of the Phanerozoic eras, and is subdivided into six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.

The Paleozoic Era began with the Cambrian Explosion, a period of rapid diversification of life that began about 541 million years ago. The Cambrian Explosion is marked by the appearance of the first complex animals, including trilobites, brachiopods, and echinoderms.

The Paleozoic Era ended with the Permian–Triassic extinction event, the most severe extinction event in Earth’s history. The Permian–Triassic extinction event occurred about 252 million years ago, and resulted in the extinction of about 96% of all marine species and 70% of all terrestrial vertebrate species.

Option A is incorrect because it states that the Paleozoic Era starts at 500 million years ago. However, the Paleozoic Era actually starts at 570 million years ago.

Option C is incorrect because it states that the Paleozoic Era ends at 150 million years ago. However, the Paleozoic Era actually ends at 252 million years ago.

Option D is incorrect because it states that the Paleozoic Era starts at 470 million years ago and ends at 225 million years ago. However, the Paleozoic Era actually starts at 570 million years ago and ends at 252 million years ago.