Question

why did early attempts to classify organisms based on local terms fail?

lack of scientific interest
difficulty in observing organisms
variability in local terminology

Explanation:

Early attempts to classify organisms using local terms failed mainly because of the variability in local terminology. Different regions had their own names for organisms, which led to confusion. For example, a single species might have multiple names in different localities. This lack of a standardized naming system made it difficult to communicate and classify organisms accurately.

Answer:

variability in local terminology