|
|
|
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Human Skeleton
Human embryonic stem cells stained with Tra-1-60 (green) - a stem cell marker and nestin (red), a ne
Three phylogenetic representations of modern human origins.
Human activity has released carbon from sequestration in long-term reservoirs