Pseudogenes are DNA sequences that resemble functional genes but seem to have no purpose. The presence of similar eta globin pseudogenes in humans and chimps has been used as an argument for common ancestry of the two species.
The philosophical context in which biology is presented can make an important difference in its meaning for the student. The philosophical worldview of the biblical Christian is quite different from that of the non-Christian; thus, the biology teacher may have a profound influence on the development of worldview by the student.
A collection of short commentaries on scientific papers published in 1991, covering topics such as Permian trees, molecular genetics, epigenetics, inheritance of paternal mtDNA, water and formation of petroleum, water in mantle rocks, impacts, Ordovician volcanism, molecular phylogenies of ratites, termites, cichlids and sabertooths, osteocalcin in dinosaur bones, fossil flowers, origin of life, Precambrian predation, stromatolites, Cambrian Explosion, quality of fossil record, rapid speciation, tree biogeography, Miocene ape, fossil dermopteran, Asian marsupial, dinosaurs, mammal-like reptile. Published in Origins v. 19, n. 2.
In the early development of the theory of evolution by natural selection, two men stand out as having played a central role: Charles Darwin and Alfred Wallace. Both men traveled widely and were keen observers of nature. For both men, visits to islands played an important role in developing their understanding of nature. Darwin's visit to the Galapagos Islands is of special interest.
Vitamin C is important in vertebrate physiology, but is acquired in different ways. Some mammals and perching birds do not synthesize it and must get it in their diet. Most other mammals and birds synthesize vitamin C, in their kidneys, the livers, or both. The pattern of synthesizing sometimes follows taxonomic patterns and sometimes not. Published in Origins v. 12, n. 2.
Some prominent scientists had educators have declared that creation has failed the test of science and has to be discarded. However, ideas that have been discarded are sometimes found to be true. Creation should not be discarded, because there is no better explanation for design in nature and the origin of life. Published in Origins v. 12, n. 1.
Animals with high metabolic rates (birds and mammals) are capable of greater work output (speed, etc) but are restricted in size and shape in order to avoid losing too much body heat. Reptiles and amphibians have lower metabolic rates, and can survive at much smaller sizes and elongated shapes than birds or mammals. This is interpreted as a result of design for a diverse ecosystem. Published in Origins v. 9, n. 2.
Creationists who want to use the scientific method need to develop and test theories based on creation, and not to be satisfied merely to show that some phenomenon is designed. Published in Origins v. 7, n. 1.
Coral reefs take time to grow, and some have questioned whether certain coral reefs could have grown to their present size in the time since the Flood. Evidence reported here indicates that rates of coral reef growth are quite variable, depending on water temperature, carbonate concentration, and depth. At the surface, ultraviolet light inhibits coral growth, so surficial measurements of coral growth are not a good basis for estimating rates of growth. Under ideal conditions, coral is capable of growing fast enough to produce present coral reefs in the time since the Flood. Published in Origins v. 6, n. 2.
Rabbits have a mechanism for re-processing food after it has fermented in the cecum. This is functionally equivalent to the cud-chewing of cattle, in which fermented food is redirected so that the nutrients produced by bacterial action can be utilized by the mammal. Published in Origins
v. 4, n. 2.
A living mollusk from the eastern Pacific is similar to a Silurian fossil thought to be extinct for millions of years. This "living fossil" (a "Lazarus species") is a major discovery in mollucsan biology. Published in Origins v. 3, n. 1.