The largest mass extinction took place some 250 million years ago and wiped about 65% of the world's existing species.
Answer the following statement true (T) or false (F)
False
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Which of the following phrases best describes the outcome of the Green Revolution?
A) an agricultural disaster, as well as an ecological and social failure B) an agricultural and ecological failure, but a social success C) an agricultural and ecological success, but a social failure D) an agricultural success, but an ecological and social failure E) an agricultural success, as well as an ecological and social success
What causes a decrease in oxygen levels beyond the sunlit layer?
A) The respiration from marine animals and bacteria B) The by-products of photosynthesis C) There are fewer animals present D) None of these choices
One important feature of the world's population with the most significant future implications is that
A) the natural increase rate is larger every year. B) there are fewer people in the world now than at the peak in the middle of the twentieth century. C) the most rapid growth is occurring in the less developed countries. D) people are uniformly distributed across Earth. E) the less developed countries have the highest combined crude death rate.
Describe the difference between persistence and steady-state forecasts
What will be the ideal response?