An arc
It is called the shaded part!
yes
In a frog the first part of the small intestine is called duodenum. The second part is called the ileum. The small intestine leads to the large intestine.
That is called an "arc".
A small piece or part of something is called a portion of whatever the thing is.
it is called ....a bit part.
The first portion of the small intestine is a small curved portion called "duodenum".
The Galaxy is called the Milky Way. The solar system is a small part of it.
Ribosomes
A bit part or cameo apperance.
Small parts are called 'Bit parts'. But there are no such things as "small parts just small actors."