Examlex
The atomic number is defined as the number of:
Mammary Glands
Specialized organs in mammals that produce milk to nourish newborn offspring.
Four Chambered Heart
A type of heart structure found in mammals and birds, consisting of two atria and two ventricles, facilitating separate circulation of oxygenated and deoxygenated blood.
Vertebrates
Animals with a backbone or spinal column, including mammals, birds, reptiles, amphibians, and certain fish.
Primate Lineage
The evolutionary path and family tree of the primate order, which includes humans, monkeys, and apes.
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