I think c and d is the best answers
During swallowing, the air passageway of the phaynx is covered by the epiglottis
It means that they are safe, wholesome, and correctly labeled and packaged.
Answer:
The first cause of eutrophication is the increase level of nutrients in water.
Explanation:
Then the other effect follow:
1.- Nutrients promote more phytoplanckton at the surface of the body water.
2.- phytoplancton die and settle down at the bottom.
3.- since in the bottom there is no much more sun, the algae at the bottom start to die, plus the phytoplacton that is falling, the sediment at the bottom start to grow.
4.- Since there is any living thing that can produces oxygen in water( it produces hypoxic conditions), other living things start to die.
