Answer:
When one thing dies, or is taken away from the food web, then this could happen:
Let's say plants are taken away. Then, herbivores have nothing to eat, sot hey die. Then, carnivores have nothing to eat, and the same thing happens, etc.
Plants are the base of survival for every organism in nearly every ecosystem.
Meiosis is used to to make sex cells.
Mitosis is used to make regular cells for you body.
It is about 78%, I hope that this helped :)
Friedrich Miescher in 1869
Thermal energy transfer. Ex. Hot to Cold