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Answer:
Two possible reasons for the massive extinction at the end of the Paleozoic Era are an asteroid collision and massive volcanic eruptions.
Explanation:
The massive extinction that occurred at the end of the Paleozoic Era is the biggest extinction from what is known so far. The majority of the species died out, and whole families of animals and plants were wiped out of the face of the Earth. It was only small and highly adaptable organisms that managed to survive and give rise to the later life-forms.
The two possible reasons for this massive extinction are an asteroid impact and massive volcanic eruptions. An asteroid collision would have created drastic changes in a matter of minutes and hours, with effects lasting for a long period of time, thus eliminating the majority of the life. Massive volcanic eruptions, with the Siberian super-volcano being the prime candidate, may have caused enormous amounts of carbon dioxide and sulfur dioxide to end up in the atmosphere, thus rapidly changing the living conditions on the planet.
4. "Tropical" is the one among the following choices given in the question that is the<span> predominant climate of South America. The correct option among all the options given is the fourth option.
5. "Albatross" is the one bird species among the following that </span><span>is found almost exclusively in the Southern Hemisphere. The correct option among all the options given is the third option.</span>
Answer:
Country A: Stage 2 with a high birth rate and a youthful population and is a developing country.
Country B: Stage 4 with a low birth rate and low death rate with an aging population. It is a developed country and there is a possible Stage 5.
Explanation:
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