资讯

Guided by ultrasound, the abortionist grabs the baby's leg with forceps. The baby's leg is pulled out into the birth canal. The abortionist delivers the baby's entire body, except for the head.
The skeletal system comprises 206 bones and has two main parts: the axial skeleton and the appendicular skeleton. The skeletal system includes your bones, ligaments that attach bone to bone, and ...
When all you’ve got is a hammer, everything looks like a nail. And when you’ve got a scanning electron microscope, everything must look like a sample that would be really, really interesting ...