Allopatric speciation is just a fancy name for speciation by geographic isolation, discussed earlier. In this mode of speciation, something extrinsic to the organisms prevents two or more groups from mating with each other regularly, eventually causing that lineage to speciate.
The downside of this is that it can only tell if youâve engaged in drug use in that window. For example, if you smoke marijuana on a daily basis but stop 2-3 days prior to your mouth swab test, the results will probably come back negative. It canât detect prolonged use or the remaining presence of a trace amounts like a urine test can.
Rating Newest Oldest. Best Answer: Marijuana is detectable in urine for 48-72 hours after single use. Habitual or chronic use can be detected in urine for up to 12 weeks depending on quantity, duration, and frequency of use.When you smoke, eat or vaporize marijuana then it will enter your body into your blood stream where it will end up at your liver that will do it's best to filter out the THC.ating Newest Oldest. Best Answer: Marijuana is detectable in urine for 48-72 hours after single use. Habitual or chronic use can be detected in urine for up to 12 weeks depending on quantity, duration, and frequency of use.