Medium ground finches are variable in size and shape, which makes them a good subject for a study of evolution. The first event that the Grants saw affect the food supply was a drought that ...

It is based on two types of protein: opsins, which change shape when light strikes them, and ion channels, which respond to the shape-shifting by generating an electrical signal. Genetic research ...

"Life history theory predicts how natural selection should shape the way organisms parcel their resources into making babies" (Reznick 2010, p. 124). The theory does so by analyzing the evolution ...

Dotted Yet (left) and Oleksii G (right)/ Shutterstock Yes - this is called recurrent evolution. Traits that have emerged many times include a streamlined body shape suited to swimming and the ability ...

“The central idea of biological evolution is that all life on Earth shares a common ancestor,” according to Understanding Evolution, a joint project of the University of California Museum of ...

Daily and seasonal variations in temperature, annual cycles of precipitation, and larger swings in climate shape adaptations ... Journal of Human Evolution 45, 145-153 (2003).

Acanthodians are not at all shark-like in shape, for they have diamond-shaped scales and spines in front of all the fins,' says Emma. 'But they do have a cartilage skeleton, a shark-like skull and jaw ...