It allows to test a inference, and analyze data to determine if the inference of the observation was correct.
I mean this is pretty obvious it's D. life expectancy is sort of close but not really. B is close too but it's not it bc that's not what health is. you could be over weight and not be sick and it still isn't healthy. and C isn't close at all. hope this helps, have an amazing day :)
1 and 2 are correct
Genes for the trait are present in both genders
Growing a beard in males is a sex limited trait
Explanation
The traits CAN be expressed physically
Anyone can have green eyes regardless of gender
