In the case of every species, many different checks, acting at different periods of life, and during different seasons or years, probably come into play; some one check or some few being generally the most potent, but all concurring in determining the average number or even the existence of the species.
Where these words come from
- 95% sureThese words were traced back to where they first appeared. That source is listed below.
- On the Origin of Species (1859); Exact wording and attribution checked. Discussion of interacting ecological checks on populations in the chapter on the struggle for existence.
- On the Origin of Species (1859)
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