Infertility is usually defined as: select one: a. childlessness. b. the inability

I believe the answer is: b. the inability to conceive after one year of unprotected intercourse

In united states, the rate of infertility among women is around 12% and 15% among men .The most common causes of infertility, are :low sperm count, improper temperature within the female host's body, and hormonal imbalance in the host's body 

Erik Erikson suggested that middle adulthood encompasses a period he characterized as generativity-versus-stagnation stage , where a person is, or is not, making a contribution to family and community.

Explanation:

Generativity versus stagnation is the seventh of eight stages of Erik Erikson's theory of psychosocial development. This stage takes place in middle adulthood (ages 40 to 65 yrs). Generativity refers to "making your mark" on the world through creating or nurturing things that will perdure an individual.