Darwin Called Competition a __ for Existence

This page is the CodyCross answer for the clue below from Renaissance, Group 1392, Puzzle 2 (Marciana Library).

Question is: Darwin Called Competition a __ for Existence

and the answer is: STRUGGLE

Word Meaning:

STRUGGLE — A contortion of the body in an attempt to escape or to perform a difficult task.

Definitions from Wiktionary.

Darwin called competition a __ for existence — CodyCross Answer | CodyCross Solutions