Maintenance of normal sinus rhythm
antidysrhytmic drugs are used to treat abnormal rhythm of the heart. Abnormal rhythm is usually due to the irregular electrical stimulation of the electrical activity of the heart. This can work by correcting the cardiac function there are four classes of this drugs such as Class I for sodium channels, Class II which are the beta blocker, Class III which are the drugs that prolong repolarization and Class IV which are the calcium channel blocker.
        
             
        
        
        
Answer: 
2-Air masses are colliding with each other.
Explanation:
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- From the image given below its clear that the warm is rising upwards and as a result of the collision from the cold winds or front from below, hence the development of clouds that make the thunderstorms appear.
- And a result of this turbulent the rising air is pushed and the warm front cycle takes a turn and will lead to either development of cyclone or rainfall.
 
        
                    
             
        
        
        
A. The fossils are an extinct species of elephants, and they’re related to present-day elephants. 
The fossils are an extinct specie of elephants, and they're related to present day elephants.
Hope it helps.
 
        
                    
             
        
        
        
Answer:
Mist netting is a capture method commonly used by scientists and their assistants who study wild birds and bats. ... Instead of being purely academic questions designed to add another paper to one's CV (curriculum vitae; this is an academic's résumé), the risks associated with mist netting birds are a valid concern.
Explanation: