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.
E
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In the aerial imagery (Map T-20b), notice that the dry gorge around the half-circle-shaped hill looks like a ridge surrounding a depression. Why does it appear this way?
The question is based on color Maps T-20a and T-20b (in the back of the Lab Manual) and Figure 32-3, a black-and-white stereogram, showing the entrenched meanders of the Green River near Canyonlands National Park, Utah. A larger portion of this region is shown in color Map T-7 in the back of the Lab Manual. What will be an ideal response?
By the year 2025, it is projected that ________ of the world's population will live in water-stressed areas.
A. 25% (one-fourth) B. 66% (two-thirds) C. 33% (one-third) D. 90% (nine-tenths)
Which of the following is accurate about bottled water?
A) It is often harvested from an area that needs water and is sold elsewhere. B) It requires less energy than providing water from a local aquifer or stream. C) It should not be used for emergencies but is a practical solution for augmenting drinking water on a large scale. D) Michigan has approved commercial production in all areas of the state.
Which is NOT TRUE regarding land degradation?
A) Poverty is a major cause of land degradation. B) Land degradation can lead to landslides. C) Soil compaction is one form of land degradation. D) Land-use change has universally negative effects on human well-being. E) Demand for more food production contributes to overexploitation of good agricultural soil.