Definition: Allopatric speciation occurs when populations are physically separated by geographical barriers, leading to genetic isolation.

Example: Islands demonstrate allopatric speciation as populations become isolated and develop distinct genetic pools over time.

Vocabulary: Sympatric speciation refers to species formation without geographical isolation, often through pre-mating or post-zygotic barriers.

Highlight: Selection pressures like soil salinity and food availability drive intraspecific competition, leading to the survival of organisms with advantageous alleles.

Definition: Natural selection is the process where organisms with favorable traits are more likely to survive and reproduce in their environment.

Example: The camel demonstrates multiple structural adaptations including humps for fat storage, large feet for desert navigation, and specialized nostrils for sand protection.

Vocabulary: Physiological adaptations are internal processes that maintain homeostasis without conscious control.

Highlight: Convergent evolution occurs when different species develop similar adaptations in response to comparable environmental challenges.