Heather has a painful headache. she takes some aspirin and the pain stops. in the future when she has a headache, she will also take aspirin. skinner would say that the taking of aspirin to reduce headache pain is

What is a common risk associated with illegal drugs?

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*edit* i took the test and i picked a and it was incorrect for its c! rank the following suggestions for preventing std, in order of increasing effectiveness. 1) using latex condoms properly 2) using spermicidal foam or jelly with a monogamous partner 3) abstaining from sexual intercourse and genital contact a. 1, 2, 3c. 2, 1, 3