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Peaks on the landscape correspond to genotypic frequencies at which the average fitness is high, valleys to genotypic frequencies at which the average fitness is low. adaptive logic: A behavior has adaptive logic if it tends to increase the number of offspring that an individual contributes to the next and following generations.If such a behavior is even partly genetically determined, it will tend to become widespread in the population.The carbon-14 decays with its half-life of 5,700 years, while the amount of carbon-12 remains constant in the sample.

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Do you think oil and natural gas can be made from fossils?How long do you think it takes fossil fuel to form? Petroleum, which is Latin for “rock oil,” is a fossil fuel, meaning it developed naturally from decaying prehistoric plant and animal remains.Millions of years ago, much of the Earth was covered with swamp.Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.

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