Actual coverage will always differ somewhat from what is printed here. Fossil remains show only unicells for billions of years.
Multicellular organisms are recent invention in evolution.
Multicells Different organization from unicellular life Multicellular organisms are cell communes. Cells must still be able to grow and divide. Almost all cells can divide by process called mitosis to generate two equal daughter cells. All multicell organisms go through developmental process to form new organism, start life as new single cell. Every 30 minutes. need to replace worn out tissues.