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Coronaviruses are a group of common viruses, which usually affect the respiratory tracts of mammals; they can…
Angina Pectoris is used to express temporary chest pain caused by myocardial ischemia, and ischemia occurs b…
The heart is the engine that does not stop working, it constantly pump blood, a unique muscle is different fr…
Marine organisms Water covers more than 70% of the Earth's surface area, and 97% of the Earth's water…
Most fish are cold-blooded, a vertebrate aquatic animal. There are more than 30,000 species of fish, many of …