1. Darwin's Argument
... with another of the same species, or with the individuals of distinct species, or with the physical conditions of life" (Darwin 63). This struggle produces the setting for natural selection. If a species population is to remain constant, environmental pressures from the three sources previously mentioned must balance every species' tendency to increase at a geometric rate. However if ... modifications of instinct might be profitable to a species", and as previously established, any inheritable and profitable variation can be preserved and accumulated through natural selection (Darwin 20...
- Word Count: 3127
- Approx Pages: 13
- Has Bibliography
- Grade Level: Undergraduate