Suffering the impact of swarms of locusts, a farmer uses an airplane to spray a malathion, a neurotoxic agent, over 1,500 acres of his corn field. This farmer is trying to address this pest problem by using
A) a chemical treatment.
B) an agricultural treatment.
C) an ecological control.
D) integrated pest management.
A
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For the following reaction, identify whether the compound in bold is behaving as an acid or a base.H3PO4 + H2O ? H2PO4- + H3O+
A. acid B. base C. neither D. both E. none of the above
What meridian is opposite the Prime Meridian?
A) Tropic of Cancer B) 90° meridian C) 180° meridian D) 320° meridian E) Tropic of Capricorn
Sedimentary rock is formed ________
A) the cooling of igneous rock B) as sediment materials are pressed together and infiltrated by minerals C) the heating of igneous rock by the heat of the core D) vaporization of organic material by magma E) from the melting of metamorphic rock
Most ecologists now recognize that mature, late-successional ecosystems ____.
A. are in a state of continual disturbance and change B. are in a stable state of equilibrium C. are in natural balance with their environment D. have followed an expected path to their stable state as a climax community E. have inevitably progressed through succession and no longer face competition