(redirected from positive chemotaxis). Also found in: Dictionary/thesaurus, Medical, Wikipedia. see taxis taxis, movement of animals either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). The turning movements of plants in response to stimuli are called tropisms...... Click the link for more information. .
USPS first class mail takes anywhere from 3 days to 14 days depending on when they process it, if the address is legible, etc.The average seems to be 7-10 days as of lately, unless you are shipping it within the same city.f it's international shipping, the only first class option is airmail which has no tracking and can take from 7-21 days. If you go with priority international mail, it's much more expensive - $15 and up-and takes around 7 days.
Location: London. Ratings: +2,494. depending on the size of your item, 15 days is not a time period to worried about especially as it was First Class International (Remember, USPS or the United States Postal Service is basically the American equivalent of Royal Mail).