Answer:
A zygote generated by ICSI displaying four PNs of approximately the same size and two of smaller size (150× magnification). Only one polar body is visible.
Explanation:
According to the CDC, on September 14th, 2014 a man traveling from Liberia to Dallas, Texas was the first person to be diagnosed in the U.S. He did not have any symptoms when he left Liberia.
I would say its 2. Working with harsh chemicals
