Break down the terms
biceps
triceps

Muscles have their origins (also known as heads) and insertions. Those are places where the muscles are anchored.
A word biceps is made of two Latin words: bi - two and ceps - head. So, biceps is two-headed muscles. It has two origins: coracoid process of the scapula and supraglenoid tubercle.
Similarly, a word triceps is made of three Latin words: tri - three and ceps - head. So, triceps is three-headed muscles. It has three origins: infraglenoid tubercle of scapula, above the radial sulcus, and below the radial sulcus.

Mesosphere is the lowest temperature at that point due to the height and how close it is to space.

If this was the appropriate answer make sure to mark as the brainliest!
-procklown