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Phineas and Ferb love to build things and can get a bit competitive with each other. However, the competition is friendly and they show little emotional investment in who wins. What type of competition are they exhibiting?
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby while removing waste products.
Pregnancy
The condition of having a developing embryo or fetus in the uterus, marked by various physical and hormonal changes.
Hormones
Chemical messengers produced by the endocrine glands that regulate bodily functions and processes.
Trophoblast
A layer of cells surrounding the blastocyst in early pregnancy, that provides nutrients to the embryo and develops into a large part of the placenta.
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