the region of a chromosome to which the microtubules of the spindle attach, via the kinetochore, during cell division.
Brainliest Please :)
A shell is considered as biotic (living) because it is a hard, rigid covering of many animals such as snail, sepia, pila, turtles, sea urchins. A shell is protective outer layer of these soft bodied animals.
Because there are millions in our body
