The correct answer is suicide. Many people between these ages have mental health issues, such as depression. This can lead to depressive thoughts and sometimes suicide.
Cancer is less common, and heart disease is often in older people. Homicide is known as the unlawful killing of a person, which is often another meaning for murder. This is much more uncommon.
Discerning means being able to evaluate information in order to judge whether it is true or not.
The placenta is delivered after the fetus.
Life expectancies indeed aren't executed to continue on an upwards dramatic trajectory as this was the case so far. The reason for this is that we have had a dramatic improvement in worldwide healthcare that won't be accomplished again in such a great way anytime soon.