Identify each of the substances in the following chemical reactions as acting as an "acid" or a "base."PH3 + H2S ? PH2- + H3S+
What will be an ideal response?
From left to right: acid, base, base, acid.
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Marx argued that commodities are
A) just things. B) too expensive. C) important for the happiness they bring. D) embodiments of social relations. E) at the heart of an economic system.
Groundwater at lower elevations flows within the zone of saturation toward areas where the water table occupies a higher elevation
a. True b. False Indicate whether the statement is true or false
Highs, lows, fronts, and conflicting air masses frequent the ____
a. prevailing westerlies b. polar region c. doldrums d. horse latitudes
Which of the following best matches the description?Stage in the flow of energy in an ecosystem.
A. habitat B. secondary consumer C. interspecific competition D. producer E. biomass F. community G. intraspecific competition H. limiting factor I. ectoparasite J. herbivore K. nitrogen-fixing bacteria L. carbon cycle M. nitrogen cycle N. omnivore O. trophic level P. denitrifying bacteria