Final answer:
The answer is true. Dichotomous keys are scientific tools used in biology to identify organisms based on observable traits, using a series of binary questions to narrow down to a single identification.
Step-by-step explanation:
True or false? A dichotomous key is an important scientific tool, used to identify different organisms, based on the organism's observable traits. The answer to this question is true. Dichotomous keys are indeed used in scientific fields, particularly in biology, to help distinguish and identify organisms based on a series of yes/no or binary questions that relate to the observable characteristics of the organisms. Starting with general traits and moving toward more specific features, a dichotomous key narrow down the possibilities until a single organism can be identified.
For example, scientists might use a dichotomous key to classify bacteria found on human skin. They would start with broad questions such as whether the bacteria are Gram-positive or Gram-negative, and proceed with more detailed questions about morphology, staining reactions, and biochemical tests, referencing resources like Bergey's Manuals for guidance. By systematically using these binary questions, the scope of possible organisms is reduced until the correct identification is made.