Why do organisms break down complex molecules of for into smaller molecules

These molecules are passed along the food chains. When plants and animals die, the complex biological molecules are decomposed. Dead organisms are broken down into smaller pieces by the process of decay.

Explanation:

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.

it would be a gas formation