Question

For women in their thirties, a single act of intercourse is half as likely to produce a pregnancy as it would for 19- to 26-year-old women. This is because aging results in a gradual decline in female _____.

Answer 1

Fertility.

Step-by-step explanation:

Fertility may be defined as the natural capacity of the organism to produce the offspring. Fertility depends on the various factors like age and ability of the organism.

The woman has the high reproducing ability at the early 30's and a single intercourse may result in pregnancy. But the age increases the woman loses her ability to reproduce and her fertility ability decreases with the increases age. The aging process might affect the reproducing ability of the organism.

Thus, the answer is fertility.