Why is it difficult to measure background extinction rates?
What will be an ideal response?
?The following reasons make it difficult to measure background extinction rates:1. Extinction is a slow process, which makes it difficult to document.2. The majority of the earth's species have not been identified.3. Scientists must learn more about the ecological roles of species to estimate how sensitive they are to extinction and how the extinction of one species will affect the survival of other species.
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Referring to the scenario in the previous question, respond to this question:
Resurgence of the cottonwood forest along the riverbank led to cooler water in certain areas of the river. Cool water contains more oxygen than warm water. How would this cooler water affect the native fish populations in the river? a. they would decrease b. they would stay the same c. they would initially increase and then decrease d. they would increase e. they would be choked out by the algal bloom that resulted from the increased oxygen
When an acid reacts with a base the reaction is called which of the following?
A) neutralization B) precipitation C) redox D) single displacement
Which of the following is NOT TRUE regarding food resources?
A) Subsidized agriculture in the developed world negatively impacts farmers in the developing world. B) The gulf between the well fed and the hungry is vast. C) Many people in the world suffer from chronic malnutrition. D) The sharpest nutritional differences in the world are from country to country. E) Hunger among the world's poor is often attributed to deforestation, soil erosion, and other environmental impacts.
Which of the following is NOT a government policy to improve the financial position of U.S. farmers?
A) U.S. Public Law 480 B) encouragement to avoid production of crops in excess supply C) government financing with commodity prices are low D) government purchase of surplus production E) encouragement of planting fallow crops