Related Experiment Video
Updated: Mar 20, 2026

10:52
Gamete Collection and In Vitro Fertilization of Astyanax mexicanus
Published on: May 25, 2019
10.6K
Offspring or phoronts? An alternative interpretation of the "kite-runner" fossil
1Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom ross_piper@yahoo.com.
Abstract
No abstract available in PubMed .
Related Concept Videos
The Fossil Record
28.3K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
28.3K
Phylogeny
64.4K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
64.4K
Life Histories
23.2K
Overview
23.2K
Inclusive Fitness
43.6K
Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
43.6K
Convergent Evolution
34.3K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
34.3K
The Evidence for Evolution
49.9K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
49.9K

