I want to say either fertilization or fertility
Not entirely sure
FOOD CHAINS FOLLOW A SINGLE PATH AS ANIMALS EAT EACH OTHER.
hope that helped!
Explanation:
All living things breathe, eat, grow, move, reproduce and have senses. Non-living things do not eat, grow, breathe, move and reproduce. They do not have senses.
Grass because without it none of those species would be living