Abandonment of less productive lands and adoption of soil conservation technologies since the 1930s have significantly reduced erosion on U.S. farms
Indicate whether the statement is true or false.
Answer: TRUE
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Ruben has a new puppy and wants to feed it the best possible food. He decides on an experiment where he will feed it the very best canned food plus a dietary supplement of vitamins recommended by a veterinarian
Which of the following best describes Ruben's project? A) Ruben needs to take careful measurements of the puppy's weight and height at least once a week for it to be a good experiment. B) This is an example of an excellent, controlled experiment as it is written. C) Ruben needs to use his mother's 6-year-old chocolate shar-pei to feed a standard diet so he can compare his puppy with a control dog. D) Ruben needs to control for the amount of exercise, sunshine, water, and care that the puppy gets each week, so that they are equal from week to week. E) This is not an experiment—there are no controls or replicates.
The terms leader, flash, and stroke are used when describing:
A) a tornado. B) squall line formation. C) the stages of a thunderstorm. D) the passage of a hurricane. E) lightning.
Which scientist is most closely associated with showing that DNA is the molecule that carries hereditary information?
A) O. Avery B) G. Beadle C) E. Chargaff D) J. Watson
Accounting for over half of all deforestation in tropical regions is the ________
A) need for urban development B) harvesting of natural forest products for food C) unlimited supply of land D) need for agricultural expansion E) highly productive nature of tropical soils