Category
Evolution
Explore the 9 entries currently assigned to this category. These counts describe this curated catalogue, not the size or rate of change of the field itself.
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Not a fact anymore
Early tetrapods grew slowly or moderately, like modern amphibians; rapid juvenile growth evolved later with amniotes.
What we know now
Rapid juvenile growth was already present in some stem tetrapods more than 320 million years ago. Early tetrapods used a wider range of growth strategies than the old amphibian-like ancestral model allowed.
- Status
- Narrowed
- Category
- Evolution
- Accepted for
- Not quantified
- Changed approximately
- 2022
Not a fact anymore
Dire wolves were close relatives of gray wolves within the genus Canis.
What we know now
Dire wolves were not close gray-wolf relatives within Canis. Ancient DNA first showed a much deeper split in 2021, and higher-coverage genomes published in 2026 now suggest that dire wolves had an admixed ancestry involving two ancient canid lineages.
- Status
- Reclassified
- Category
- Evolution
- Accepted for
- Not quantified
- Changed approximately
- 2021; refined in 2026
Not a fact anymore
Mammalian spinal evolution was a simple transition from reptile-like side-to-side bending in early synapsids to mammal-like up-and-down bending.
What we know now
Fossil synapsid vertebrae do not support a simple shift from lizard-like side-to-side bending to mammal-like up-and-down bending. Early synapsids appear to have had relatively stiff spines, with later mammals evolving several kinds of regional movement and specialization.
- Status
- Superseded
- Category
- Evolution
- Accepted for
- Not quantified
- Changed approximately
- 2021
Not a fact anymore
Natural background radiation is an important source of the spontaneous mutations that fuel evolution.
What we know now
Ionizing radiation can certainly mutate DNA, but at ordinary background levels its contribution to spontaneous mutation appears to be small. In a Lenski-style E. coli experiment beneath 1,700 m of rock, the absorbed dose rate fell from 214 to 26 nGy per hour, yet adaptation did not measurably slow over 500 generations. Replication errors and endogenous DNA chemistry provide abundant mutation sources even when ambient radiation is stripped away; ultra-low radiation can still affect cell physiology.
- Status
- Narrowed
- Category
- Evolution
- Accepted for
- Not quantified
- Changed approximately
- 2010s
Not a fact anymore
Protists form one coherent natural kingdom of simple eukaryotes.
What we know now
“Protist” is a useful informal label for many eukaryotes that are not animals, plants, or fungi, but protists do not form one natural evolutionary branch. Different organisms once placed in Protista belong to several widely separated lineages.
- Status
- Superseded
- Category
- Evolution
- Accepted for
- ≈135 years
- Changed approximately
- 1980s–present
Not a fact anymore
All living things fit naturally into five kingdoms: animals, plants, fungi, protists, and monerans.
What we know now
The five-kingdom system—animals, plants, fungi, protists, and monerans—does not accurately represent all major evolutionary relationships. DNA and RNA comparisons showed that organisms once grouped together as Monera actually include two very different lineages, Bacteria and Archaea, while 'Protista' contains many distantly related branches.
- Status
- Superseded
- Category
- Evolution
- Accepted for
- ≈9 years
- Changed approximately
- 1970s–present
Not a fact anymore
Natural selection always requires thousands or millions of years to produce measurable evolutionary change.
What we know now
Evolution can be measured over years or decades when traits are heritable and selection is strong. Rapid changes have been observed in microbes, insects, fish, birds, mammals, and humans.
- Status
- Overturned
- Category
- Evolution
- Accepted for
- ≈122 years
- Changed approximately
- 1950s–present
Not a fact anymore
Mitochondria and chloroplasts developed entirely within complex cells and have no evolutionary relationship to bacteria.
What we know now
Mitochondria and chloroplasts descend from bacteria that once lived independently. Ancient host cells took those bacteria inside, the partnership became permanent, and over evolutionary time the former bacteria became organelles—specialized structures inside the cell.
- Status
- Overturned
- Category
- Evolution
- Accepted for
- ≈42 years
- Changed approximately
- 1960s–1980s
Not a fact anymore
Bodily changes acquired through use, disuse, or environmental conditions were widely thought to be inherited and to direct evolutionary change.
What we know now
Evolution mainly works through inherited variation: genetic differences that can be passed from parents to offspring. Changes acquired during an individual's life—such as stronger muscles from exercise or the loss of a limb—are not generally written back into the inherited genetic material. Some environmental effects can persist across generations, but they are much narrower than classical Lamarckian inheritance.
- Status
- Superseded
- Category
- Evolution
- Accepted for
- Not quantified
- Changed approximately
- 1880s–1930s
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