Why does oil take so long to form in nature? O A. The life cycle of the organisms that are fossilize into oil takes millions of years.
OB. The process of burying remains under deep sediment takes millions of years.
OC. The reactions that change biochemicals to shale take millions of years.
O
D. The reactions that change shale to oil take millions of years.

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.