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The question is : explain the greenhouse effect.

My

The greenhouse effect is the way in which heat is trapped close to the surface of the Earth by greenhouse gases such as : carbon dioxide, methane and nitrous oxides. This will then increase the Earth´s temperature over the time as the heat, which is trap in the Earth, ca not escape, thus leading to cause various disasters such as thermal expansion and to the ice from land to start to melt, which then could lead to flood as the water level will start to rise significantly.

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

no sé si entiendes español pero te daría la respuesta si lo supiera, pero lo siento mucho