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What is/are some of the advantages of oxygen concentrators?I. Low cost for bedridden patientsII. Oxygen percentage increase with increase in flowIII. Can be used as a portable unitIV. Does not need refilling

Which of these descriptions best explains the difference between early and mid- to late 18th-century poetry?

equitability in the distribution of individuals among species within a community

the identity of the species present in a community

the number of individuals of a species relative to the total number of individuals of all species living in the community

index that measures the species richness in one sampling site within a region

index that measures the species richness that is different among sampling sites within a region

a species that has a disproportionate impact on the community relative to its abundance

a group of species inhabiting a given area and interacting directly or indirectly

Given the gas-phase reaction  2SO2(g) + O2(g) ⇄ 2SO3(g).  Suppose that the reaction has already taken place, and the system has come to equilibrium. If the following changes are made to the system in equilibrium, tell what effect these changes will have on the system (whether the equilibrium is shifted to the left, is shifted to the right, or is not shifted).