Essential Hypertension
The resource that accounts for roughly 90 percent of Botswana's export earnings are diamonds.
Dimonds
The most common form of arterial hypertension is primary (or essential) hypertension, which accounts for about 90-95% of all cases. This type of hypertension has no identifiable cause and is thought to result from a combination of genetic, environmental, and lifestyle factors. Risk factors include obesity, high salt intake, sedentary lifestyle, and family history. In contrast, secondary hypertension is caused by specific medical conditions or medications and is less common.
91 percent of all mammals
Essential hypertension is presence of sustained hypertension (>140/90) mm hg without any presence of disease.
I would assume that resource would be crude petroleum.
Epithelium
90 percent of what?
Yes, all Peace dollars are 90% silver.
90
"90 percent" means 0.9, and "of" in arithmetic usually means "times". 0.9 x 90 = 81. 90 percent of 90 is 81.
FORTY IS WHAT PERCENT OF 90? FORTY IS WHAT PERCENT OF 90?