The noise of thunder is caused by ___ A. Rapid of expansion of air
B. Clouds rushing past each other
C. Rain hitting the ground
D. Two air masses colliding

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

the answer is c because it is most logical.

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 . : ) : ) : )