Question

how is a dichotomous key used? the organism is compared to paired pictures of organisms until a match is found in the key. the organisms 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.

Explanation:

A dichotomous key uses sequential two-part (dichotomous) questions about observable traits to narrow down organism identification. Each step splits options into two, guiding to the final ID.

Answer:

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