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Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.