Stretching and maintaining a healthy diet, however it depends on your genetics more unfortunately
An indicator species is an organism whose presence, absence or abundance reflects a specific environmental condition. Indicator species can signal a change in the biological condition of a particular ecosystem, and thus may be used as a proxy to diagnose the health of an ecosystem.
An abortion. It is carried out for many reasons including unwanted pregnancies, cases where the parents are too young, lack of funds to keep the baby, death of baby inside the womb etc.