Add spaces between the words in the following text: Inthefiveyearsofthe25samplesselectedfor12ofthemostinterestingandsustainableforest-steppezoneofWesternSiberia.Theydiffersignificantlyfromeachotherintheirbiologicalcharacteristicsassociatedwithenvironmentaldifferencesintheirnaturalhabitats.
In the five years of the 25 samples selected for 12 of the most interesting and sustainable forest-steppe zone of Western Siberia. They differ significantly from each other in their biological characteristics associated with environmental differences in their natural habitats.