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.
Manama 10 day weather forecast, updated four times a day and shows the weather summary plus detailed sun, rain, snow, wind and temperature. The weather forecast extends out to 10 days showing information for morning, afternoon and overnight. See the links below the weather forecasts for other cities, towns and villages near Manama.