Answer:
Acid rain as burning is fossil fuel doesn't lead to acid rain.
Answer:
Sewage-contaminated water causes eutrophication, which is the increase in concentration of chemical elements required for life. The nitrates, phosphates, and organic matter found in human waste serves as a food for algae and bacteria.
Explanation:
To me it looks like its a population of birds slowly changes feather color from red to blue.❣
Answer: 2
explanation: enzymes are known as proteins used to break down proteins and other macromolecules during digestion