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How is a dichotomous key used?
The organism is compared to paired pictures of organisms until a match is found in the key.
The organism’s DNA is sequenced and compared to the DNA sequences that are listed in the dichotomous key.
Observable characteristics of the organism are checked through a sequence of two-part steps until an identification is listed in the key.
Observable characteristics of the organism are listed in a group and compared to different groups of observable characteristics listed in the key.

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Answer: A dichotomous key is typically used by checking observable characteristics of the organism through a sequence of two-part steps until an identification is listed in the key.

So, the correct option is:

Observable characteristics of the organism are checked through a sequence of two-part steps until an identification is listed in the key.

Explanation: In a dichotomous key, users are presented with a series of choices or questions about the characteristics of the organism being identified. Based on the characteristics observed, the user selects the option that best matches the organism. This process continues through a series of paired choices until a specific identification is reached.

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