Q: Mike grew tomatoes on his parcel of land and so did John. Mike's attempt was very successful, because he adjusted the soil's pH to a viable level for growing vegetables, and John didn't. Both parcels had soils with lots of sodium carbonate in them. John's experiment failed. Which soil had less favorable physico-chemical properties?
A: John's

Q: Two related native tribes live thousands of miles away from each other. Ana tribe lives near the South Pole in Antarctica, while Momu tribe lives in Northern Alaska near the North Pole. Which tribe was less exposed to an increased risk of skin cancers?
A: Momu

Q: Two brothers had very different diets. Vick would constantly eat foods high in fat and would frequently overeat. Zack on the other hand, had a higher metabolic rate, a faster metabolism, and he would eat the correct amount of calories. Which brother had a lower chance of increased health problems?
A: Zack

Q: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution. Which lake had a lower natural mortality last year?
A:
Silver Lake