Answer: people from serberia probably walked on feet over to america in the late ice age. it was covered with a thick sheet of ice and was hard to inhabit.
Explanation:
the first plants and anthropodes appear on land approximately about 470 million years ago
Answer:
C. include global warming, which is greatly enhanced by society's production of greenhouse gas
Explanation:
Human activities such as burning of fossil fuel, industrial waste has lead to the emission of greenhouses such as carbondioxide, carbon monoxide, methane, chlorofloro carbon accumulation of which in the atmosphere leads to global warming as a result of the depletion of the ozone layer and the direct impact of sun on the earth.
The depleted ozone layer has lead to the constant and high temperature
that is affecting the earth.
Green plant,trees are natural users of carbondioxide but deforestation of this trees has also reduce the use of carbondioxide making it abundant in the atmosphere.
Answer: High-income households are more likely to have computers or Internet access. Among family households with incomes of $75,000 or more during the 12 months prior to the survey, 88 percent had at least one comput- er, and 79 percent had at least one household member who used the Internet at home in 2000.
Explanation:
