Of the following choices, which kills the most crop-eating insects each year?
A. spiders
B. pesticides
C. insecticides
D. grasshoppers
Answer: A
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The water cycle, hydrogen cycle, phosphorous cycle, and sulfur cycle are all ____________________
Fill in the blanks with correct word
A factor that can influence earth's temperature but not be influenced by humans is
A) aerosol concentration. B) atmospheric albedo. C) surface albedo. D) variations in solar radiance.
All modern reptiles are ____
A)ectotherms B)endotherms C)echinotherms D)unitherms E)antitherms
Alpha Centauri is a famous star because it is one of the closest stars to earth (other than the sun of course). Where would you look in the night sky for Alpha Centauri?
A) Look for Hydra, then to the right for Hercules, and it will be half way between. B) Look for the second brightest star in the constellation Alpha. C) Look for the brightest star in the constellation Centaurus. D) RA 15hr 30min; D 56 degrees