true
False
False, it cannot
False. In 1998, the U.S. economy did not include more than 270 million businesses. In fact, there were approximately 20 million businesses in the United States at that time. The figure of 270 million is likely a misunderstanding or misrepresentation of the number of businesses.
False. An ECG (electrocardiogram) primarily measures the electrical activity of the heart, including heart rate and rhythm, but it does not provide direct information about valve function. Valve function is typically assessed using imaging techniques like echocardiography.
False. Ecosystems do not have distinct boundaries; they often overlap and blend into one another. The transition zones between ecosystems, known as ecotones, can exhibit unique characteristics and species. Additionally, factors such as climate, geography, and human activity can influence the extent and interaction of different ecosystems.
False. A dormant volcano is not the same as an inactive volcano. A dormant volcano has not erupted in a long time but still has the potential to erupt again, while an inactive volcano is unlikely to erupt again.
False
false
diamond
false
No, Extinct = Not likely explode again Dormant = hasnt't erupted for hundreds or thousands of years but may still erupt Active = Recently erupted, and is likely to erupt
False
False.
False. Nobody can prevent a volcanic eruption, though scientists have some ability to predict eruptions.
Yes, listening is a passive activity
False
false (They became extinct about 65 million years ago.)