Answer 2: Snails are really interesting! Most snails are considered to be hermaphrodites and have both male and female reproductive organs. Snails are able to reproduce when they are 1-year-old (they live to be about 5-7 years old but some as long as 25 years!) at which time they must find a snail partner to mate with.
The posterior descending artery, which is also known as the posterior inter-ventricular artery, is a branch of one of the heart's main arteries. In most people, the posterior descending artery branches away from the right coronary artery, which is called right coronary artery dominance. In left coronary artery dominance, the posterior descending artery branches away from the left circumflex artery.
The left main coronary artery arises from above the left portion of the aortic valve and then usually divides into two branches, known as the left anterior descending (LAD) and the circumflex (Circ) coronary arteries. In some patients, a third branch arises in between the LAD and the Circ.