Geologic time scale - Wikipedia Geologic time scale - Wikipedia

Tabulate the differences between relative and radiometric dating of fossils. Palaeos: main glossary

An anatomist, Kimbel worked with Don Johanson and assembled Lucy's skull fragments. He also established the first weather warning system while on his journeys, with the help of the telegraph, and later rose to the rank of Admiral in the British Navy.

A professor of biology who studies population biology and the ecology and evolution of host- parasite interactions. The term exobiology is similar but more specific — it covers the search for life beyond Earth, and the effects of extraterrestrial environments on living things.

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A mode of coping with competition or environmental conditions on an evolutionary time scale. Criticised by popular science writers like Stephen Jay Gouldbut remains a very influential meme.

A biologist who studies the causes and evolutionary implications of interactions among traits in predators and their prey.

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Darwin defined this term as "descent with modification. Compare with ancestral homology. His recognition that the virus is active right from the beginning of infection led him to initiate the deployment of a combination of drugs to overpower the virus.

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Along with horsetails and ferns, these made the planet more hospitable for the first animals. The historically influential but factually erroneous theory that organisms contain a blend of their parents' hereditary factors and pass that blend on to their offspring.

There are 20 amino acids in the proteins of life on Earth. The quantitative study of characters of organisms.

The tendency of the different genes in a gene family to evolve in concert; that is, each gene locus in the family comes to have the same genetic variant.

For example, if a gene determines the seed color of peas, one allele of that gene may produce green seeds and another allele produce yellow seeds. The study of genes and their relationship to characteristics of organisms.

A mutation causing one structure of an organism to grow in the place appropriate to another.

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A group of organisms comprising the kingdom Fungi, which includes molds and mushrooms. Her Gay dating nizamabad, "The Biology of Skin Color," concerns the evolution of race.

Compare with derived homology. Hence instead terms like basal tetrapod or the names of individual clades and taxa temnospondyls, lepidospondyls, Lissamphibiaetcare used.

The forms of most domesticated and agricultural species have been produced by artificial selection; it is also an important experimental technique for studying evolution. Gehring and his research group discovered the homeoboxa DNA segment characteristic for homeotic genes which is not only present in arthropods and their ancestors, but also in vertebrates up to humans.

A paleoanthropologist who, while doing field work in Ethiopia for his doctoral dissertation at the University of California, Berkeley, discovered Ardipithecus ramidus kadabba, a bipedal hominid dated at 5.

Having two sets of genes and two sets of chromosomes one from the mother, one from the father. She is married to Richard Leakey. A Canadian ecologist and recipient of the Natural Sciences and Engineering Research Council Doctoral Prize for his research on the complex symbiotic relationship of fungus-growing ants, the fungi they cultivate, mutualistic bacteria that the ants carry on their bodies, and pathogens that attack the fungi.

An extinct marine invertebrate that was related to squid, octopi, and chambered nautiluses.