<span>upslope fog hope this helps!</span>
Earth's Second Atmosphere The second atmosphere, which was the first to stay with the planet, formed from volcanic outgassing and comet ices. This atmosphere had lots of water vapor, carbon dioxide, nitrogen, and methane but almost no oxygen.
Answer:
B. Their predators have been killed by the Cretaceous-Paleogene extinction
Explanation:
The mammals and the avian dinosaurs were small creatures, living in the shadows of the dinosaurs which dominated the world, but also were stopping the further increase in size and development of these animals. At the end of the Cretaceous though, an asteroid struck the Earth. The impact was so hard and devastating that it managed to destroy the dinosaurs and wipe them out of the face of the Earth, with the only dinosaurs remaining being the small avian species. Since lots of niches opened up and where free for taking in the ecosystem, the mammals and the avian dinosaurs quickly started to evolve, diversify, and become much larger. The mammals seem to won the race for dominance as they have become the most dominant species on the planet.
The correct answer is D. Small nations are less active in world trade.
Explanation
Oceania is a continent made up mainly of islands, among which Australia and New Zealand stand out internationally. However, the rest of the countries are very little known internationally and do not actively participate in trade because they do not have large industries, nor are they sources of natural resources. These islands are mainly considered tourist destinations for their tourist attractions. Therefore, the correct answer is D. Small nations are less active in world trade.
