Over the past 20 years, the major pollutants in our world have
a.
decreased significantly
b.
increased significantly
c.
stayed at the same levels
d.
decreased slightly

You which of the following statements is true? muscle tremors are an early symptoms of alzheimer's disease. type 2 diabetes is hereditary and cannot be prevented. certain medications can cure als and parkinson's disease. exercise is a natural way to relieve pain and stress.