A migratory bat species pollinates agave plants in northern Mexico on its way to the southwestern United States where it spends the summer eating insects and reproducing
Farmers spraying pesticides affect these bats, which eat the insects and also feed them to the baby bats. This could be the start of a story about ________.
A) sustainable agriculture
B) insect biodiversity
C) an umbrella species
D) an extirpation
E) threats to a keystone species
E
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What type of atmospheric conditions does a looping smoke plume like the one shown above indicate?
A. stable B. conditionally stable C. conditionally neutral D. unstable
Over the past 200 years, the greatest change in agriculture is the
A) productivity of an acre of farmland. B) elimination of global hunger and malnutrition. C) production of insect-resistant crops. D) declining reliance on fertilizers for crops.
Vietnam's population density is high in the south, around the city of Saigon and the nearby:
A) city of Hanoi B) Mekong River C) Strait of Malacca D) Khorat Plateau
Which of the following molecules is polar?
A) CH3-CH3 B) CH2Cl-CH2Cl C) CH3-CHCl2 D) none of these