Of all the natural biomes, this one is most modified by human activity
A) midlatitude grassland
B) tropical savanna
C) tropical rainforest
D) midlatitude broadleaf and mixed forest
A
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Which of the following is not a characteristic of quartz?
A) hardness of 7 B) commonly occurs in six-sided crystals C) one direction of cleavage D) conchoidal fracture E) made up of SiO2
Large number of French-speaking Africans and Arab Muslims live in what areas of the cities and towns of western Europe?
A) close to the central city B) in highly integrated and diverse neighborhoods C) in high-density apartment buildings in the suburbs D) in the central city and in highly integrated and diverse neighborhoods
Stream velocity is often measured for different subsections of a stream cross section using a moveable current meter
Indicate whether the statement is true or false
Ethyl chloride is prepared by the reaction of ethane with chlorine according to the reaction: 2 C2H6 (g) + Cl2(g) ? C2H5Cl(l) + HCl(g) The percent yield of ethyl chloride in one experiment was 96.3% and the actual yield was 74.4 g. How much ethylene did the chemist use in this experiment?
A) 35.5 g B) 38.7 C) 70.9 g D) 77.3 g