I think it is B. Earths magnetic feild
But i'm not sure.
The correct answer is B. a fossilized fish
That is because the scientist can use carbon dating to find the age of the fish, and that will tell the scientest the date of the layer of rock. :)
Answer:
A: (Z)-3-chloro-4-ethyl-2,5-dimethyl-3-hexene
B: (<em>cis</em>)-3-chloro-4-ethyl-2,5-dimethyl-3-hexene
Explanation:
The two two heavier groups around the double bond are chlorine and isopropyl.
Both of these heavier groups are on the same side therefore, they are designated as cis or Z conformer.