Answer:
they are not effective against viral infections such as a cold or flu.
The leading cause of deaths in the united sates are heart diseases followed by cancer.
As per the latest researches about 30.2 million people in the United States suffer from heart diseases like heart attack, faulty heart valves, atherosclerosis, heart failure, hypertension, arteriosclerosis etc. And this number keeps on rising every year making it accountable for one in every four deaths caused in the country followed by cancer.
The common causes may include higher blood pressure, more cholesterol levels in the blood, obesity, smoking, alcoholism, tobacco consumption etc. Cancer is another leading cause affecting nearly 5.3 percent of the population making United States one of the most effected country by the disease.
To know more about Cancer refer to the link below
brainly.com/question/373177
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