How  can acid rain affect decomposers in an ecosystem? a. acid rain  lowers the ph of soil,  which can kill the decomposers living in the soil. b. acid rain increases the ph of soil, which can kill  the decomposers living in the soil. c. acid rain damages the leaves and branches of plants, which  are the main energy source for decomposers. d. acid rain decreases the amount of oxygen in the atmosphere, which can hinder the growth of decomposers.