Question

what is 'struggle to survive'?​

Answer 1

Answer:

In On the Origin of Species, Darwin claimed that there was a continual 'struggle for existence' in nature, in which only the fittest would survive. This theory came partly from his reading of Thomas Malthus's Essay on the Principle of Population.

Answer 2

Answer:

the competition in nature among organisms of a population to maintain themselves in a given environment and to survive to reproduce others of their kind.