Answer:
? the question isn't clear
Explanation:
Answer:
Explanation:
Rivers may be contaminated by sewage.
I do hope I helped you! :)
Answer:
Proteins and nucleic acids
Explanation:
Nitrogen compounds in animals that are no longer of use, or are in access are excreted from the animals body, and are thus called nitrogenous waste. These nitrogenous waste can be excreted in three different ways.
1. Ammonia
2. Urea
3. Uric acid
Most plants are called autotrophs they make their own food
3! You have to ensure balance of all the different elements.