What is the average cell cycle span for a mammalian cell?

What is cell?

What is meant by cell cycle ? Explain.

What is the nature of cell walls in diatoms?

In 24 hour average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.

What is the nature of cell-walls in diatoms?

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is