Question:

The principle of superposition states that in undisturbed layers of rock, the oldest layers are always on the bottom and the youngest layers are always on the top. Fossil records of plants and animals found within the layers describe changes in life forms over time.

During an expedition, a geologist discovers fossils in the surface rock layer of the same species as fossils found in deeper rock layers. However, the fossils differ slightly in structure.

Briefly explain in a five to six sentence paragraph the condition stated.

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i think slash and

the answer is barium and copper bromide

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.