Yes, it is.
C. The effects of acid from decaying animals
the effects of acid from decaying animalsThe questions sounds like you were given choices which you didn't list. I would say "acid rain"
chemical a +
chemical
chemical
chemical
a coal fired power plant.
To know which of the following is a source of chemical weathering the abrasion of running water someone needs to know what the choices are. It says which of the following, but does not say what the following is. This is needed to know the answer.
Animals dig, this loosend the soil & breaks apart rocks. Source: My science teacher
No. Chemical weathering is only when acid rain etc. is involved. I suppose you could call this 'natural weathering' but I'm not sure that is the correct term because it is simply water freezing and expanding.
Chemical energy made in food that the animals eat.
Dead or decaying matter in nature becomes a food source. Nutrients enter the soil and insects and other animals invade the dead or decaying matter for food.