Theory of natural selection ( note 1 )
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Observation 1
all species have a huge potential fertility
observation 2
except for seasonal fluctuations, populations tend to maintain a stable size
observation 3
Environmental resources are limited
inference 1 struggle for existence how? environment?
The production of more individuals than the environment can support leads to a "struggle for existence," with only a fraction of offspring surviving in each generation.
Observation 4:
No two individuals in a population are exactly alike.
Observation 5:
Much of the observed variation in a population is heritable.
inference 2 hereditary makeup and survival
survival in the struggle of existence is not random, but depends, in a part on the hereditary makeup of the survivors, Those individuals to inherit charactersitics The struggle for the survival of existence depends on a part on the hereditary makeup of the survivors, Those individuals to inherit charactersitics
inference 3
Unequal reproduction between suited and unsuited organisms will eventually cause a gradual increase with in a population with favourable characteristics to that particular environment