A cellular column running through the center of the hair is known as the .

medulla. cellular column running through the center of the hair. mitochondrial DNA. DNA present in small structures (mitochondria) outside the nucleus of a cell.

Explanation:

menstruation is a process in which blood and mucous flows out every month through the vagina. this process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilized egg.

explanation:

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no, because those are both different running competitions. while distance runners train their legs and their lungs to run long amounts of time, the sprinters are training their legs and their lungs to give all they have in the little amount of area they need to cover. the brain also plays a huge part in all of this.

the brain is the only thing in your body that sends messages to your body telling you to run. if you are a long distance runner and you have the mind set of a sprinter, you will not get anywhere. if you have a long distance mind set and you have to run 200m in 20 seconds then you will not make it in time.