Answer:
option C. x 
8
Explanation:
x + 5 13
x + 5 -5 13 -5 ........subtract by 5 on both sides
x 8
1. Three (3) Phylums
2. Nine (9) Classes
3. The Class has more groups.
4. The Phyla contains more organisms.
Answer:
Eutrophication.
Explanation:
This is the natural process of excessive enrichment of water with nutrients by which large amount of living organic matter grows in the water.lakes slowly develop large concentration of aquatic life, which eventually decays. Human activities have speeded up this natural process of eutrophication by adding mineral and organic nutrient in larger quantities.
The answer is foreign pathogens.
