Anatomy Development period- week 1,2,3,4 0aca551e Morula has how many cells A 8 B 16 C 32 D 64 High-Yield Explanation Morula is a 16 cell stage Advanced morula >32 cell stage Advanced morula enters uterine cavity on day 4 Blastocyst is formed by end of day 4 covered with zona pellucida