Examlex
Amphibians are dependent on water and moist environments for their life cycle.Which stages require an aquatic environment, and why is such an environment necessary? Do any amphibians have strategies that allow them to avoid the aquatic stage? If so, describe them.
Afterbirth
The placenta and fetal membranes expelled from the uterus following the birth of a baby.
Placental Stage
The third and final stage of childbirth where the placenta is delivered.
Trophoblast
The outer layer of a blastocyst, providing nutrients to the embryo and developing into a large part of the placenta.
Placenta
An organ that develops in the uterus during pregnancy to provide oxygen and nutrients to the growing baby, while removing waste products.
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