Babies are made when special cells called sperm (produced by men) combine with cells called eggs (produced by women) in a process called fertilization. Each of these cells is produced by a process called meiosis which makes cells containing half the information of the parent.
So a tripod position is when someone is sitting and leaning over, either with both hands on their knees or their elbow on one knee while the other hand is on the hip. They do this because they cant breathe