Blank have the potential to develop and specialize into any cell type, which means they're a embryonic stem cells; multipotent b embryonic stem cells; totipotent c adult stem cells; totipotent d adult stem cells; mulipotent

A embryonic stem cells

 It takes 7 days for a new red blood cell to develop from stem cells. Stem cells are similar to base cells. They can also be seen as a general template from which specialized cells are made. Stem cells can be taken from a newborn baby's umbilical chord or extracted from an adult blood donor's blood.
For example.
A red blood cell lives for between 100 and 120 days. Then these are aided by stem cells as they become red blood cells.

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.