elements are naturally unstable as they break down over time to more stable forms.

What shape would a molecule with two bound groups and two lone pairs have?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

The excretory system,need answers for all: )