Is extinction natural? How has the extinction rate changed over time? Why are extinction rates today different than in the past?
What will be an ideal response?
Students should discuss some of the following. Extinction is a natural process. Extinction rates have risen higher than the background extinction rate during several mass extinction events during Earth's history. In the past 440 million years, there have been five major episodes of mass extinction. If current trends continue, the modern era may see the extinction of more than half of all species. While similar in scale to previous mass extinctions, today's ongoing mass extinction is different in two respects. First, humans are causing it. Second, humans will suffer as a result.
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Relative humidity is
A) the amount of water vapor in the air compared to the normal amount. B) the amount of moisture in the air relative to your own sensible feelings. C) the amount of water vapor in the air relative to the water vapor capacity of the air. D) a basically unused concept when it comes to weather topics.
How many different bases are found in DNA?
A) 1 B) 2 C) 3 D) 4
Which country was formerly named Zaire?
a. Burundi b. Mail c. Malawi d. Democratic Republic of Congo e. Zimbabwe
What is the difference between a glacier's zone of accumulation and zone of ablation?