Final answer:
Since 1980, the rate of childhood asthma in the United States has significantly increased, more than doubling during this time. option b
Step-by-step explanation:
The rate of childhood asthma in the United States since 1980 has more than doubled. This increase can be attributed to various factors such as air quality, increased recognition of the disease, and diagnostic practices. It's an issue of growing concern for public health officials and researchers trying to understand and combat the rise of asthma cases.
The rate of childhood asthma in the United States since 1980 has more than doubled. This increase can be attributed to various factors such as air quality, increased recognition of the disease, and diagnostic practices