Scientific Evidence Supporting Biological Evolution

Evidence of Evolution

Biological evolution refers to all the changes that have occurred in living things since they appeared on Earth, which have produced biodiversity. There is a lot of evidence to support the theory of evolution and no evidence against it.

Anatomical and Morphological Evidence

Fossil Evidence

Evolutionary Series

Fossil records from different time periods show the slow, progressive evolution of species. Horse fossils are one of the best-preserved examples of this.

• Evolutionary Links: These are organisms from two different groups that show intermediate stages of development from a primitive to a more modern form.
• Living Fossils: Organisms that still retain primitive characteristics.
• Faunal Succession: The chronology of strata shows the age of different fossils; the oldest strata contain the most primitive fossils, and younger strata contain more recent fossils.

Biogeographical Evidence

The geographical distribution of animal and plant species shows that isolated groups of animals evolved in different ways, although they share similar characteristics from a common ancestor.

Molecular Evidence

Living things share the same genetic code, and all proteins are made up of the same 20 amino acids. This suggests that they have a common origin. For example, chlorophyll is found in every green plant, and hemoglobin is found in vertebrate blood, showing that these two kingdoms have a common evolutionary origin. The study of molecules in living things shows a closer evolutionary relationship between groups of organisms that have similar molecules. Comparative analysis of the DNA, RNA, and protein sequences of different species allows us to revise and define their evolutionary relationships.

Artificial Selection

Humans have domesticated animal and plant species for thousands of years. They deliberately selected the characteristics they wanted to strengthen. If we compare modern breeds with previous wild species, the differences are enormous. These differences show that artificial selection can have profound effects that modify the appearance of an animal compared to its ancestors.

Coevolution

Coevolution is the process in which two species mutually influence each other during their evolution:

• Mutualism: Some species have evolved in parallel because they obtain a mutual benefit. For example, flowers produce nectar that insects eat, while insects help with pollination.
• Parasitism: Similar parasites are found in closely related species. For example, pelicans and geese share the same type of lice. However, they are different from the lice on storks, which are more distant in terms of evolution.
• Mimesis: Some harmless species have developed false warning signs similar to those of venomous animals to scare off predators.