Chelsea has severe coronary heart disease. this condition is most closely linked to:

Chelsea has severe coronary heart disease. This condition is most closely linked to unhealthy lifestyle habits.

Explanation:

Severe coronary heart disease is caused by partially or totally block  blood flow in the large arteries of the heart.  

There are some factors that increases the risk for developing coronary artery disease for example Smoking tobacco can damage the blood vessels. Stress can trigger the tightening of the arteries. Consume high amounts of saturated fats or trans fats can lead to plaque buildup in the heart's arteries.

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

i think its the first one