The variation of organisms within a species increases the likelihood that at least some members of the species will survive under changed environmental conditions.
Learning Goal 1b
A great diversity of species increases the chance that at least some living things will survive in the face of large changes in the environment.
Evolution of Life
For Grades: 9-12
Learning Goal 3
Natural selection provides the following mechanism for evolution: Some variation in heritable characteristics exists within every species; some of these characteristics give individuals an advantage over others in surviving and reproducing; and the advantaged offspring, in turn, are more likely than others to survive and reproduce. As a result, the proportion of individuals that have advantageous characteristics will increase.
Learning Goal 4a
Heritable characteristics can be observed at molecular and whole-organism levels—in structure, chemistry, or behavior.
Learning Goal 4b
Heritable characteristics influence how likely an organism is to survive and reproduce.