Of the estimated 30,000 plant species that people can eat, only ____ of them supply an estimated 90% of the world's food calories.
A. 3
B. 6
C. 14
D. 42
E. 88
Answer: C
Environmental & Atmospheric Sciences
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If a neutral element has the following chemical notation, how many electrons does it have? carbon-13
A) 6 B) 12 C) 13 D) 7 E) none of the above
Environmental & Atmospheric Sciences
Which of the following is true of tides?
A) They are unpredictable for most all areas on Earth. B) There is one cycle per day. C) They have small effects on landforms. D) Daily ranges cannot exceed two meters (6 feet). E) They are caused by Earth's rotation.
Environmental & Atmospheric Sciences
An example of a "cruiser" is a ________
A) flounder B) grouper C) mackerel D) shark E) tuna
Environmental & Atmospheric Sciences
When sunlight interacts with a raindrop to produce a rainbow, how many refractive events occur for each drop?
A) 2 B) 1 C) 42 D) zero
Environmental & Atmospheric Sciences