What is the relationship between coronary artery disease and a heart attack?
coronary artery disease is a symptom of heart attacks.
heart attacks reduce blood flow to the heart and cause coronary artery disease.
coronary artery disease can reduce blood flow to the heart and cause heart attacks.
heart attacks occur when coronary artery disease is treated.

Coronary artery disease can reduce blood flow to the heart and cause heart attacks.

Explanation:

Formation of plaques in coronary arteries results in coronary artery disease. This artery serves to deliver oxygenated blood to the myocardium. Atherosclerotic plaque (build-up of fatty substances, collagen fibers, and muscle fibers) reduces the ability of arteries to stretch, thickens their wall and reduces their diameter. There is reduced blood flow to myocardium leading to heart attack.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.