That would be Sternum as it is also called the "breastbone".
Answer:
The boundary between two air masses that have different temperatures or humidity. In the mid-latitude areas of the Earth, where warm tropical air meets cooler polar air, the systems of fronts define the weather and often cause precipitation to form.
Explanation:
Scientific definition for front
The frequency of radiation from a Cesium-133 atom is 9,192,631,770 cycle/s
=
×
cycles/s
The number of cycles of radiation in one second is
×
The number of cycles during 1 mosquito wing beat,
i.e., the number of cycles in 
=
×

=
×
Learn more about radiation
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As you move down a group, atomic radius increases