In a rural hilly neighborhood, a landowner uses bulldozers to clear all but the largest trees and cleans up a nearby stream, lining the bottom of the stream with decorative rocks and stepping-stones
Planting lawn grasses around the base of the trees, the owner wants to create a park-like setting around his home. We expect that in this ecological simplification of the cleared yard, there will be A) more species of invertebrates in the stream and on the land but fewer species of vertebrates and plants everywhere.
B) more mammal and plant species but fewer birds and invertebrates on the land and in the stream.
C) fewer species of vertebrates and plants everywhere but more invertebrates in the stream.
D) fewer species of plants, invertebrates, and vertebrates everywhere.
D
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How is the number of unpaired valence electrons in an atom related to the number of bonds that the atom can form?
A. The number of unpaired valence electrons in an atom is twice the number of bonds that the atom can form. B. The number of unpaired valence electrons in an atom is one-half the number of bonds that the atom can form. C. There is no defined relationship between the number of unpaired valence electrons and number of bonds that the atom can form. D. The number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.
How many valence electrons does gallium (Ga, atomic no. = 31 ) have?
A) 1 B) 6 C) 3 D) 31 E) 70
What specifically connects the continental shelves to the deep-ocean floor?
a. Continental rise b. Continental slope c. Shelf break d. Submarine canyon
The adsorption of metal cations to aquifer particle surfaces is partially a function of:
a. oxidation-reduction potential b. matric potential c. log KOW d. pH