Examlex
In addition to empirical association, what are the two other criteria needed to assess a cause-and-effect relationship between a dependent and an independent variable?
Umbilical Vein
A vein in the umbilical cord that carries oxygenated blood from the placenta to the fetus.
Ductus Arteriosus
A fetal blood vessel that connects the pulmonary artery to the aortic arch, allowing blood to bypass the lungs in utero.
Lactation
The process of producing and secreting milk from the mammary glands of mammals following childbirth, providing essential nutrients to the newborn.
Estrogen
A group of steroid hormones responsible for the development and regulation of the female reproductive system and secondary sex characteristics.
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