Explain the concept of same dna in all body tissues

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

Does any one know what blood tastes like