These are means by which one species becomes multiple species. The difference is actually pretty simple: In allopatric speciation, a population becomes separated by some kind of geographical barrier that prevents genetic mixing. A simple example would be a pond that was once part of a river. The animals on either side of the barrier would now be subject to selective pressure independently. This is the most common type of speciation. In Sympatric speciation, species diverge without physical separation. One of the best studied examples of this is the rift lakes of Africa.
Manassas 10 Day Weather. 1  Thursday:The Manassas forecast for Apr 20 is 72 degrees and Partly cloudy. There is 60 percentage chance of rain and 3 mph winds from the South-Southwest. 2  Friday:The Manassas forecast for Apr 21 is 75 degrees and Sunny. There is 58 percentage chance of rain and 7 mph winds from the West.
Current weather in Manali is total fine sunny. temperature at night goes around 8 to 10 degree at night times. Temperature at day time is good around 18 to 22 degree. Bring warm cloths with you. Thanks & Regards. Guru Manali