Why are plants a good source of potential drug compounds?
A) because there are thousands of different plants with thousands of different chemicals in them
B) because natural products are much more effective than synthetic products
C) because it is far cheaper to grow chemical compounds in a plant than it is to synthesize them in the laboratory
D) all of the above
E) none of the above
A
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Which of the following is central to most of the efforts to conserve topsoil?
a. an emphasis on agricultural practices that enhance monocultures b. annual crop rotations c. keeping the soil covered by vegetation d. preventing insect pests from destroying valuable crops e. conversion of croplands into pasturelands or feedlots
The detachment and removal of fragmented rock material is known as _______.
a - diastrophism b - sedimentation c - leaching d - regolith stripping e - erosion
Explain the significance of direct and indirect consumption of grains
What will be an ideal response?
The property which primarily controls how much water can be present as a gas is:
A) availability of latent heat. B) temperature of the air. C) amount of dry air gases present. D) number of particulates present. E) water's specific heat.