However, parts of the skeleton are calcified, like bone, including the skull (2), spine (3), and sensory pores (4), all labeled in red. Biology in the background Skates’ cartilage skeletons are strong ...

The bacteria are red (1) and the intestinal tissue around them is yellow (2). Click on the right arrow to see another view of salmonella (which are orange in this image). Biology in the background ...

Red-eyed tree frogs, Agalychnis callidryas ... Warkentin has demonstrated a phenomenon that is transforming biology. After decades of thinking of genes as a “blueprint”—the coded DNA ...