Levels of norepinephrine rise when there is a potential for danger, stress, or excitement. The third choice, petting a rabbit, is the only choice that would tend to calm, rather than scare or excite, a person.
The square above is based on the eye color of two parents. One of the parents has brown eyes and carries the recessive gene for green eyes (a). What is the probability that a biological child of these parents will have brown eyes?