A routine OB examination of the fetal head reveals no cerebral parenchyma and large anechoic area surrounding midbrain. These sonographic findings most likely indicate

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13