In an attempt to stop desertification, some groups have changed the way they work with the land
They plant trees to stop erosion, build small barriers to slow water runoff on slopes, and bring food to their animals rather than letting them graze freely. Why would these techniques help stop desertification?
A) They increase the amount of water used in the area.
B) People move out of the areas rather than follow these techniques, lessening the water demand.
C) They break up the cyanobacteria in the soil.
D) Trees, runoff diversion, and changes in grazing patterns all conserve water.
E) The trees increase evaporation.
D
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A drug that inhibits the Y5 receptor has been shown to
a. have an effect on body weight in normal rats. b. have an effect on body weight in obese rats. c. have an effect on food intake in normal rats. d. have an effect on food intake in obese rats. e. have no effect on food intake or body weight in any rats.
Which structure is incorrectly paired with its tissue system?
a) companion cell - ground tissue b) palisade parenchyma - ground tissue c) guard cell - dermal tissue d) tracheid - vascular tissue e) root hair - dermal tissue
In 1977, ________ was the first researcher to sequence a genome.
Fill in the blank(s) with the appropriate word(s).
When might imperfect multicollinearity not require the collecting of more data to remedy the likely imprecise estimates of the affected variables?
A. When the treatment effect is positive B. When the imperfect multicollinearity is confined to control variables only C. When the model suffers from heteroscedasticity as well D. When you are only conducting hypothesis tests