0 a relationship between two types of animal or plant in which each provides for the other the conditions necessary for its continued existence --
1 a close connection between different types of organisms in which they live together and benefit from each other --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.