Mass spectral analysis of 3,3-dimethyl-2-butanone results in several fragmentation pathways. Complete the mechanism below and draw the products for the fragmentation pathway that produces a mass spectrum peak at m/z 43. Include all nonbonding electrons and charges.

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.