The older that such fish become, the more mercury they may have absorbed. Anything that eats these fish within the food chain also consumes the higher level of mercury that the fish have accumulated. This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher
The goal, then, when it comes to having a boy is to increase the likelihood that a Y chromosome sperm reaches the egg first. Many medical researchers believe that Y chromosome sperm are faster swimmers, but that X chromosome sperm have more endurance.
But a man this age is more likely to take years rather than months to get his partner pregnant. The older a man is, the longer it will take him to get his partner pregnant (Sartorius and Nieschlag 2010) . The chance of conception taking more than a year is: An age gap can make a difference too.If a woman's partner is at least five years older than her, she has less chance of conceiving within a year than if her partner is the same age (Ford et al 2000) . That's the case whatever the woman's age. There is a clear difference between men and women.n age gap can make a difference too. If a woman's partner is at least five years older than her, she has less chance of conceiving within a year than if her partner is the same age (Ford et al 2000) .