Explain, in ecological terms, why cattle ranchers and conservationists have battled one another over cattle-grazing practices in the western shortgrass prairie biome of the American West. How has grazing changed the habitat?
What will be an ideal response?
Overgrazing of grasses by cattle has altered the ecosystem to favor the growth of desert plants such as sagebrush, thus threatening the organisms native to the shortgrass prairie. The overgrazing allows the wind to erode the soils and contributes to water loss.
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Which ecosystem has the lowest percentage of total net primary productivity?
a. open ocean b. savanna c. swamp and march d. temperate deciduous forests e. tundra
What is the frequency of the S1 allele in the population before the asteroid hit?
A) 0.15 B) 0.40 C) 0.50 D) 0.60 E) 0.80
You have just moved from Norfolk, Virginia (sea level), to Taos, New Mexico (high in the
mountains), and you find yourself out of breath climbing a small hill. Three months later, climbing the same hill, you have no difficulty. In the interim you have not altered your level of activity or diet. Which hormone has been at work? a. angiotensin b. erythropoietin c. aldosterone d. estrogen e. anti-diuretic hormone
Which kind of T cells regulate the immune response by producing stimulatory lymphokines?
A. cytotoxic T cells (TC) B. suppressor T cells (TS) C. helper T cells (TH) D. memory T cells (TM)