In order to conserve resources, Evelyn uses her old homework as scrap paper and never throws away paper with writing only on one side,
What kind of conservation is Evelyn practicing?
A. Recycling
B. Waste
C. Renewal
D. Reuse

Evelyn is using reuse as a form of conservation

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: