Fullerenes are examples of which of the following type of solid?
A) ionic
B) molecular
C) network covalent
D) polymeric
B
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Which of the following practices by farmers decreases erosion?
A) tilling B) planting ground cover crops C) allowing fields to lie empty and fallow D) removing weeds
Marker-assisted breeding allows
A) desired bacterial genes to be inserted into crops. B) beneficial animal genes to be inserted into crops. C) crop improvements without resorting to transgenic traits. D) plants that have been bioengineered to be easily identified in the field.
Which of the following features of a wave may change during its existence?
A. Height B. Height and speed C. Period D. Speed E. Wavelength
The nutrients that tend to limit photosynthesis in marine environments include ________
A) carbon dioxide B) nitrogen C) phosphorus D) carbon dioxide and nitrogen E) nitrogen and phosphorus