প্ৰাকৃতিক দৰ্শনপ্ৰাকৃতিক বাষ্প
প্ৰাকৃতিক নিৰ্বাচন (Assamese)
1. Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of... from wikipedia.org