Why do you have five fingers? Why not ten, or twenty, or one? Why do so many animals have five fingers? Five seems to be the perfect number for most hands. Oddly, the first vertebrates to come onto ...

Among the many misconceptions about evolution—“it’s only a theory”; “it works for the good of the species”—one is that evolution generates biological perfection. If only! In “The Evolution of ...

hi this is Matt Baker welcome to episode four in my series on The evolutionary tree of life in the first three episodes we covered the animal kingdom including insects fish reptiles birds and mammals ...

Our red blood is full of iron. We need iron for growth and for immunity. It is even added to foodstuffs, such as cereals, to ensure that there is enough of this nutrient in the diet to prevent iron ...

CC0 Usage Conditions ApplyClick for more information. To some extent classification is subjective. Taxonomists differ in the relative importance they ascribe to particular characters and in the degree ...