During Early Cleavage in Animal Embryos,minimal Growth of the Embryo

Multiple Choice

During early cleavage in animal embryos,minimal growth of the embryo is observed,even though rapid cell division is taking place.How might this lack of growth be most easily measured without destroying the embryo?

A) oxygen uptake measurements
B) vital dye uptake measurements
C) measurements of embryo movement
D) counting the number of nuclei in the embryo