What is missing in the following nuclear equation?

A. neutron

B. beta particle

C. proton

D. alpha particle

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

the dissolution of polymer can be thermodynamically described in 2 steps.