TEHRAN, Jun 9 -Researchers have unearthed a collection of chinquapin fruit and leaf fossils in Patagonia that suggests the oak and beech family, one of the most important plant families, has evolutionary roots in the Southern Hemisphere.
TEHRAN, May 07 -"Because there is no direct record of atmospheric oxygen during this time period it has been difficult to determine what factors might have kick started this crucial point in evolution," researcher Tianchen He said.
TEHRAN, Apr 24 -The heads of Gouldian finches feature one of three different colors: yellow, red and black. Now, scientists know why the pressures of natural selection have failed to erase the species' color variation.