One job of the kidneys is to
a. regulate the ph of the blood.
b. produce urea from amino groups and ammonia.
c. increase the salt and water balance in the blood.
d. destroy old red blood cells.
any

they are known to reach a speed of 21 miles per hour

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )