Deforestation may contribute toward climate change because
A) it leads to habitat loss for many forest species, which invade nearby marginal habitats, including those used by humans
B) the trees naturally trap heat near the Earth's surface, and the loss of trees allows this heat to escape into space through the atmosphere
C) it leads to salinization of the land
D) loss of trees disrupts the carbon cycle, limiting the amount that is absorbed by plants, and increasing the concentration of carbon dioxide in the atmosphere
E) the forest canopy reflects some solar radiation back into space, allowing more of it to penetrate to the Earth's surface
Ans: D) loss of trees disrupts the carbon cycle, limiting the amount that is absorbed by plants, and increasing the concentration of carbon dioxide in the atmosphere
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What will be an ideal response?
One problem with both BACs and YACs is that genetic regions of these chromosomes cannot be subcloned
Indicate whether the statement is true or false.
In the absence of retroviruses, eukaryotes may also undergo reverse transcription if which of the following is present?
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A) 3.5 billion years ago B) 2.1 billion years ago C) 3.5 million years ago D) 2.1 million years ago