What are two allotropic forms of carbon? Select one:
O a. carbon-12 and carbon-14
O b. alkanes and alkenes
O c. solid carbon and liquid carbon
d. diamond and graphite

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.

1.solid

2.carbon dioxide

3.helium