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.
The male determines the sex of the child and some men are more likely to sire one sex or the other. But, no matter what sex children he's had in the past, his next child is asâ¦ likely to be a boy or a girl as his first. What has happened in the past does not affect the odds in the future. That is a man's chances of having a boy after having two girls is the same as it was when he had his first girl.