Questions with the keyword 'human body'

• why do we have baby and adult teeth?? not teen teeth? or elderly teeth? not just one set?? why do we specifically have by ava and hibba!! Comments: (So far, one comment )
• i’ve been wondering about melanin. according to my science teacher, it happened because of “survival of the fittest” by pack520much Comments: (So far, one comment )
• Good morning! My question is to you… how many cells are in a human body? by rate520john and 1 other. Comments: (No comments so far )