sentence: Some animals keep the zygote in their bodies until it is a full-grown baby.
sentences_after: The time between the forming of the zygote and the baby's birth is called pregnancy. Other animals do not keep the zygote in their bodies, but lay an egg. The zygote grows inside the egg until it is ready and a larva or baby animal hatches.
concept_name: animal
headings: Zygote
categories: Biological reproduction