Explanation:
Humans can cause population sizes to change by introducing invasive species, hunting or changing the environment. A healthy ecosystem, with high biodiversity is important in helping reduce the effects of these factors on a particular species.
<span>B.
extradition
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The statement is - C. Volcanic eruptions have prevented several mass extinctions by cooling Earth's climate.
The volcanoes and their activity have resulted in numerous positives on the planet Earth, being very beneficial for the life as a whole and eventually for the human kind.
The volcanoes though also had some very negative influences, and despite being one of the factors that enabled the life on Earth, they never prevented a mass extinction on it, instead they are responsibly for some of the mass extinctions. The biggest mass extinction dubbed as the ''Great dying'' has been caused by the activity of a super-volcano that existed in what is now Siberia. It managed to wipe out almost all life on the planet. Also, when the asteroid collided with the Earth around 66 million years ago, the volcanoes too contributed largely to the mass extinction that wiped out the dinosaurs. Even in more recent geologic times, the Toba volcano almost wiped the humans from the face of the Earth.
Answer:
The formation of carbon dioxide clouds leads to a warmer surface than what would be expected for clear sky conditions, but it also warms the atmosphere. The amount of surface warming is sensitive to the presence of dust and water vapor in the atmosphere, both of which act to dampen cloud effects.
Explanation:
The establishment of the first human settlements has been due to numerous factors, some more important than others. The most important factors were drinking water, fertile soil, production of crops, and irrigation water. These four things enabled the humans to start doing something they have never done before, settle in one place permanently and being bale to survive in it without depending strictly on mother nature. This is why the first human settlements have been made in the valleys of the big rivers. Once the humans saw the potential of some wild crops, they started to plant them. The river valleys were the best places for this. The soil was deep and very fertile, and each year there were new fertile deposits from the floods. There was always water fro drinking and irrigation, so the crops were thriving and the humans had the basic things for living at disposal. This resulted in surplus in food production, so the humans solved their biggest problem, started to use the spare time, and specialize in all sorts of things.
