Biology

Oesophagus

Large intestine

Liver

Small intestine

Decreased complexity over time

Increased dependence on external resources

Increased genetic diversity within populations

Decreased adaptation to the environment

Presence of chloroplasts

Ability to perform photosynthesis

Lack of cell walls

Heterotrophic mode of nutrition

Steppe grasslands

Temperate deserts

Savannah grassland

Tropical deserts

Variation in blood pressure among individuals

Variation in beak shape among finches

Differences in fur color in rabbits

Variation in leaf shape in plants