Question

dichotomous keys ask open - ended questions about animal behavior. open - ended questions about easily observable characteristics. yes - or - no questions about animal behavior. yes - or - no questions about easily observable characteristics.

Explanation:

Dichotomous keys use paired yes-or-no (binary) questions to classify organisms, focusing on easily observable physical characteristics (not behavior) rather than open-ended inquiries.

Answer:

yes-or-no questions about easily observable characteristics.