Prairie grasses experience grazing herbivores, wildfires, droughts, deep snow, and blazing hot days in the summer
The prairie grasses alive today are descendants of those that have survived these challenges and thus must have ________ for such an environment.
A) endemism B) predation C) speciations D) adaptations
D
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Which of the following is the most efficient form of irrigation?
a. flood irrigation b. center-pivot irrigation c. low pressure irrigation d. precision sprinkler irrigation e. micro irrigation
The synthesis of a certain drug requires 4 steps. First three steps were relatively easy with percent yields of 97.1%, 94.3% and 92.8% respectively. However, the last step was very difficult with a percent yield of 72.7%. What was the overall percent yield?
A) 27. 9% B) 61.8% C) 72.7% D) 85.0%
The scientific study of caves is known as
A) soda straw. B) ciselure. C) speleology. D) areology.
In a structural basin, the beds dip ________.
A. away from the center of the basin B. toward the center of the basin C. all in the same direction D. at a small angle E. at a large angle