Examlex
The age structure of a population is the number or percentage of
Kidneys
Organs in the urinary system responsible for filtering waste from the blood and producing urine.
Trophoblast
The outer layer of cells surrounding a blastocyst in early pregnancy, which develops into the placenta and provides nutrients to the embryo.
Amniotic Sac
A fluid-filled sac that surrounds and protects the embryo and fetus in the uterus during pregnancy.
Zygote
The first cell created through the fusion of an egg cell and a sperm cell, signifying the start of a new organism's growth.
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