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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

Which of the following molecules is polar?

A) CH3-CH3 B) CH2Cl-CH2Cl C) CH3-CHCl2 D) none of these

Environmental & Atmospheric Sciences