Methods for desalinating sea water to produce fresh water include ________
A) reverse osmosis and distillation
B) making sea water acid to transform salts to solids
C) treating with activated charcoal and clay
D) treating sea water with salt-consuming marine bacteria
E) filtration and sedimentation
A
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A. 8 B. 7 C. 13 D. 6 E. 0
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.
How many orbitals are there in the 4p subshell?
A) 1 B) 2 C) 3 D) 4
Which of the following is not a marine seed-bearing plant?
A) Eelgrass B) Mangroves C) Spartina alterniflora D) Surf grass E) Ulva