Examlex
Which of the following is the vascular organ that links the fetus to the mother's uterus?
Neutrons
Subatomic particles found in the nucleus of an atom, with no electrical charge and a mass slightly greater than that of protons.
Protons
Positively charged subatomic particles found in the nuclei of atoms which determine the element's identity and properties.
Element
A pure chemical substance consisting of one type of atom, distinguished by its atomic number.
Zinc-65
A radioactive isotope of zinc with a half-life of 244 days, often used as a tracer in studies of zinc metabolism.
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