Answer: The father determines the biological sex of a baby
Explanation: Human beings have two sex chromosomes, males have XY chromosomes whereas females have XX chromosomes. During fertilization, an egg from a woman fuses with a sperm cell from a man to form a zygote. Women have two X chromosomes (XX) and any point in time they can only release an egg bearing an X chromosome but males have one X and one Y chromosome, therefore they can either release a sperm cell with an X chromosome or a sperm cell with a Y chromosome. When an egg with X-chromosome fuses with a sperm cell with an X chromosome, the resulting baby is a female but when an egg with an X chromosome fuses with a sperm cell with a Y chromosome, the resulting baby is a male.
What makes the difference in both sexes is the Y chromosome from the man, therefore the father determines the biological sex of a baby.
The limbic system is a region in the brain consisting of the thalamus, the hypothalamus, the hippocampus, and the amygdala.
When a person has amygdala damage, it would be expected to disrupt the integration of fear.
So, this kind of person will be efficient under fear situations avoiding emotional burnout.
Careers like bridge climbing or skydiving instructor are good for this kind of person.