Zygote (zygo in greek means "joined" or "union") w/ Zona pellucida; divides @ 1 day
Morula ("Mor" rhymes with "four," here there are 4^2 cells), cavitation starts here
Trophoblast - cells begin secreting fluid into the morula ("Troph" means nourishment [atrophy=no nourishment]); not totipotent as trophoblast
Blastocoel=fluid cavity in trophoblast, Zona pellucida begins being "blast"ed away
Blastocyst=Trophoblast+Blastocoel+inner cell mass; pre-implantation state; ~5 days after fertilization; 70-100 cells; IVF possible from day 2 to now
According to wikipedia, toxin exposure up to 2-3 weeks results in miscarriage; after that toxin exposure causes malformations
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