Snails are important because without them the enemies of a snail wouldn't. have anything to eat, then the predators who eat snails wouldn't have enough. food to eat then there will be less and less of them, and then the predators.
Failure is the state or condition of not meeting a desirable or intended objective, and may be viewed as the opposite of success. Product failure ranges from failure to sell the product to fracture of the product, in the worst cases leading to personal injury, the province of forensic engineering. 1 In science.
Heart failure is the set of symptoms that hit you when your heart can't pump enough blood to meet your body's needs. It's called congestive because fluid settles in your lungs, congesting you. Honestly, I usually think of CHF as meaning Chronic Heart Failure.