7132706/469
b,8203015/798

i do not know and i have a 100 in this class

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

answer is d hope this

(nitrogen fixation) will be your answer sorry if im wrong