How do microorganisms affect soil formation? a. by releasing toxic chemicals into the soil b. by increasing the nutrient content of soil c. by improving porosity via movement through the soil d. by releasing chemicals that react to form soil particles

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

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The graph shows the populations of two species in a particular region over two decades. based on the graph, what can you conclude about the relationship between the two species? a. the two species have a parasitic relationship. b. the two species are mutualistic in nature. c. the two species exhibit commensalism. d. the two species have a prey-predator relationship. e. the two species have a familial relationship.