Contractile vacoules maintain water balance by pumping excess water out of some single-celled pond organisms. in the multicellular human the kidney is chiefly involved in maintaining water balance. these facts best illustrate that

tissue

explanation:

it is actually formed by geoup of cells which is tissue

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 . : ) : ) : )