Premature atrial complexes (PAC) dysrhythmia has a cardiac complex that occurs too soon and may have abnormal p waves, but other than being ''early,'' has no other abnormal features.
<h3>What is Cardiology?</h3>
- Cardiology is a field of medicine that deals with problems with the heart and cardiovascular system. 
- The term "cardiology" comes from the Ancient Greek words "kardi" (heart) and "-logia" (study). 
- Heart failure, valvular heart disease, congenital heart defects, coronary artery disease, and electrophysiology are all covered in the field's spectrum of medical diagnosis and treatment.
- Cardiologists are among the professionals in internal medicine who work in this area.
- Pediatricians that specialize in cardiology are known as pediatric cardiologists.
<h3>Why does cardiac happen?</h3>
- Nearly all heart conditions that are known to exist can result in cardiac arrest. 
- The electrical system of a damaged heart malfunctions most frequently during cardiac arrests. 
- An aberrant heart rhythm like ventricular tachycardia or ventricular fibrillation is brought on by this defect.
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Human blood groups are governed by three alleles. These are called I A ; I B ; I O .
I B shows the codominance 
I O is recessive to both other alleles
 
        
             
        
        
        
B) The grass height was the dependent variable.
E) Intermediate numbers of insects had the greatest positive impact on grass growth.
<h3>How insects affect the plant growth?</h3>
The grass height was the dependent variable because it depends on the nitrogenous waste of insects and presence of water. The numbers of insects had the greatest positive impact on grass growth because they provides nutrients to plant in the form of nitrogenous water so we can conclude that option B and E are the correct options.
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