Answer:
Greenhouse gases from human activities are the most significant driver of observed climate change since the mid-20th century.1 The indicators in this chapter characterize emissions of the major greenhouse gases resulting from human activities, the concentrations of these gases in the atmosphere, and how emissions and concentrations have changed over time. When comparing emissions of different gases, these indicators use a concept called “global warming potential” to convert amounts of other gases into carbon dioxide equivalents.
Explanation:
Why does it matter?
As greenhouse gas emissions from human activities increase, they build up in the atmosphere and warm the climate, leading to many other changes around the world—in the atmosphere, on land, and in the oceans. The indicators in other chapters of this report illustrate many of these changes, which have both positive and negative effects on people, society, and the environment—including plants and animals. Because many of the major greenhouse gases stay in the atmosphere for tens to hundreds of years after being released, their warming effects on the climate persist over a long time and can therefore affect both present and future generations.
Answer:
<em>A. If populations can interbreed, they are considered one species.
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Explanation:
The organisms of a species have the ability to interbreed with one another leading to the formation of an offspring. For speciation to occur, the organism have to get diverged and isolated.
In speciation, a hereditary species parts into at least two relative species that are hereditarily not quite the same as each other and can never again interbreed.
In Allopatric speciation, the species gets geographically parted from their parent and evolves accordingly while in sympatric speciation, evolution of species occur when it stays in the same place as their parent.
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