Most of the wheat, rice, and corn raised in the world has resulted from genetic engineering of one sort or another, either by crossing certain varieties or deliberately transferring genes using transgenic techniques

These methods select for plants that produce their own defenses against pests with chemicals or physical barriers. Helping to feed the world, this represents an example of A) cultural control.
B) natural enemies control.
C) genetic control.
D) natural chemical control.


C

Environmental & Atmospheric Sciences

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You just purchased a new cell phone. Why is it a bad idea to throw the old one in the trash?

A) It contains radioactive elements. B) It contains heavy metals. C) It contains PCBs. D) It contains plastic. E) It is compostable.

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What material is 10 on the Mohs scale?

A. diamond B. quartz C. talc

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A tektite is strong evidence that ________ metamorphism has occurred.

A. slow B. contact C. hydrothermal D. regional E. shock

Environmental & Atmospheric Sciences