A researcher claims that genetic variation provides organisms with the ability to survive and reproduce in different

Question

A researcher claims that genetic variation provides organisms with the ability to survive and reproduce in different environments. To support the claim, the researcher makes the following observation: bacteria that contain plasmids (small DNA molecules) are resistant to a wider range of antibiotics than are bacteria that contain no plasmids. Which of the following statements best establishes a connection between the observation and the researcher's claim? 
a. Some antibiotics inhibit the synthesis of bacterial cell walls. 
b. Some antibiotics inhibit protein synthesis in bacteria cells. 
c. Some plasmids cannot exist in a bacterial cell with certain other plasmids. 
d. Some plasmids contain antibiotic resistance genes.

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