Question

is this a run - on sentence? it is estimated that ten percent of the population has a fear of needles, medical researchers are developing devices that make injections pain - free. yes no

Explanation:

A run - on sentence is an error where two or more independent clauses are joined without proper punctuation or conjunction. The given sentence "It is estimated that ten percent of the population has a fear of needles, medical researchers are developing devices that make injections pain - free." has two independent clauses ("It is estimated that ten percent of the population has a fear of needles" and "medical researchers are developing devices that make injections pain - free") joined without a proper conjunction or punctuation like a semicolon or a period.

Answer:

yes