1) Which is the name of the statistical analysis to know if there is a relationship between variables? a) T-test b) correlation c) average d) Pearson 2) Why do we need to know the liberty degree for? a) to get the r of tables b) to get the r calculated c) to know the hypothesis 3) When is the null hypothesis rejected? a) when both r´s are equal b) when the r calcualted is less than the r of tables c) when the r calculated is greater than the r of tables 4) which are the requirements for sutainability in ecosystems? a) to have biotic and abiotic factors b) to have producers c) that wastes can be recycle d) nutrient availability, detoxification of waste products and energy availability 5) what is a saprotroph? a) it is a type of producer b) it is a consumer that makes EXTERNAL digeston c) It is a consumer that makes INTERNAL digestion 6) What type of consumer is the one that eats the producers? a) an omnivore b) a secondary consumer c) a primary consumer 7) It is an example of saprotroph: a) fungus b) worm c) wolf 8) From where do producers get their energy from? a) chemicals b) sunlight c) saprotrophs 9) Which of the following is an heterotroph? a) willow b) oak c) algae d) fitoplancton e) dolphin 10) What is population? a) groups of different species b) biotic and abiotic factors c) a group of organisms of the same specie

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