The residue on the pebbles is not just salt. It contains very many elements that go into sea water. The pH will be effected (raised) if sufficient sea salt is added.
how can population levels affect desertification
A float valve.
Yes, it would.
The ozone depleting substances affect ozone levels. They react with ozone to deplete it.
The answer will depend on the levels of WHAT!
No
NO
no
Having hypothyroidism can affect your hemoglobin levels because the low levels of thyroid causes the hemoglobin levels to drop too. These are also linked to B12 deficiency and macrocytic anemia.
Blood type does not affect cholesterol levels. Heredity, eating low-fat foods, and exercise all do affect cholesterol levels.
Yes. The tetosterone levels decrease
Yes, most common side affect of allergies are congestion and difficulty breathing. Both of which will cause decreased O2 levels and increased CO2 levels.