Scientists have always struggled with this riddle...however, new research is giving some clues to the answer.
How do antibodies work to fight off diseases like AIDS?
Why did rainforests evolve so much more diversity than other parts of the globe?
How lancewood tree leaves change to defend against the moa, a flightless bird.
Have humans evolved to be at risk for diseases like cancer?
Want to improve your groove when it comes to the Funky Chicken or the Electric Slide? Maybe you could take a lesson from the birds.
Skeletal muscles are attached to bone structures and cannot stay long in a flexed position without depleting their energy reserves.
Earthworms swallow soil, extract nutrients from it, then excrete the rest up onto the surface.
Many bird-of-paradise species have evolved colorful plumage - a result of special eating habits and behaviors.
Unfortunately, evolution often detours along a crooked path until species become more "fit" for their environments.