Which term indicates the evolution of many closely related species from one or a few ancestral species in a relatively short period of time? microevolution preadaptations adaptive radiation allometric growth allopatric speciation A significant reduction in the amount of which gas would allow more ultraviolet radiation to reach Earth\'s surface? oxygen methane ozone cyanide carbon dioxide The most common outcome of the process in the accompanying figure is no viable gametes. This happens because of hybrid inviability defective meiosis. gametic isolation species incompatibility. Solution 1. microevolution 2. defects in ozone gas layer allows more UV rays to come to the earth 3. because of defects in meiosis no viable gametes are formed.