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277 Results found for "environment"
61. The Existence and Extinction of the Dinosaurs
...sedimentary rocks. Some characteristics of these sedimentary rocks are used to identify specific environments such as beaches, rivers, swamps, lakes and arid deserts. Other fossils associated with these...
62. The True Colors of the Ocean
...patterns may be also useful for species recognition when attempting to find a mate in such a crowded environment, and they may even allow individual recognition. As a marine biologist specialized on...
63. The Geological Story Told by Iceland
...examples demonstrate that the secondary effects of volcanic eruptions can be many, and we expect the environmental pressure of the flood basalt volcanism around the world in earth’s past history to have...
64. Sociobiology: The Evolution Theory's Answer to Altruistic Behavior
...in a population of animals. Many more individuals of each species are born or hatched than the environment can support, and since the individuals in the species are not all alike, some process must determine...
65. Life in the Deep Rocks and the Deep Fossil Record
...Madison limestone of the northwest U.S.A. [1] Bacteria can readily grow when introduced into deep environments. Some that oxidize methane have been injected into coal layers to significantly reduce the...
66. Chapter 4: Once upon a Time Ther Was a Molecule...
...important class of ingredients — sugars — could have been produced in a primordial environment by the reaction of formaldehyde with alkaline substances. [15] Two types of sugars, ribose and...
67. Annotations from the Literature
...temperatures. These features make it highly unlikely that life originated in a high-temperature environment, such as around hydrothermal vents. Comment: These results reinforce previous reports that...
68. The AGEing Process
...due to mutation, the biological consequence is that modern baramins are less adaptable to adverse environmental changes. With AGEs active, new traits were routinely introduced into each population of...
69. Annotations from the Literature
...may reach 3000 m in depth. Tillites often are found among deposits that appear to be from warm environments. Since impacts can produce similar features, many tillites should be reinterpreted. The effects...
70. What Do Fossils Tell Us?
...during or after death. What happens if rapid burial does not occur? Based on what happens in modern environments, dead organisms are scavenged by other organisms or decay and are destroyed by bacterial...
71. Worldwide Occurrence of Persistent Sedimentary Layers
...Catastrophe: 51 Scientists Explore Evidence in Nature" Most individual depositional events in modern environments are episodic and spatially restricted, resulting in low net rates of sedimentation. This...
72. Raúl Esperante
...Basin in southern Peru where a thick succession of strata was deposited in a mostly shallow marine environment. There, I had several lines of research: Many of the layers contain well-preserved fossils...
73. Fossils
...for preservation. Rapid burial by sediments protects the potential fossil from destruction in the environment. Dead bodies are normally eliminated by scavengers within hours or days for a small animal...
74. Change in Species – Biblical or Not?
...genetic information may be used to correct errors when they do arise. Some evidence suggests that environmental signals may trigger gene interactions that result in beneficial genetic changes. While...
75. Interpretation of Radiocarbon and Amino Acid Age Data
...isomer ratios and estimated real time. This correlation permits significant conclusions regarding environmental conditions and climatic changes to be drawn from amino acid data on land snail shells from...
76. A Catastrophe With an Impact
...acid rain (Crutzen 1987, Diamond 1983). Many species could not cope with such alterations of the environment and would become extinct. Species resistant to the environmental disturbance would be more...
77. Chromosomal Changes in Mammalian Speciation: A Literature Review
...not adaptive (contributing to the ability of an organism to survive and reproduce in a particular environment), then chromosomal speciation is a totally random process. The establishment of newly arisen...
78. Genetic Similarity Does Not Necessarily Mean Common Inheritance
...genome-wide sorting of standing genetic variation during parallel adaptation to basic versus acidic environments in stickleback fish. Evolution Letters 3-1:28-42. Doi:10.1002/ev13.99 Three-spined stickleback...
79. Rushing to Judgment: Functionality in Noncoding or “Junk” DNA
...than others competing for the same resources. Only efficient organisms can survive in a selective environment. The large amount of noncoding DNA in eukaryote genomes seems very inefficient. One would...
80. Annotations from the Literature
...in Cambrian fossil communities. Comment. There may be a pattern in the sequence of depositional environments in which exceptional faunas (Konservat-Lagerstätten) are preserved in the fossil record...