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The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water.Amphibian larvae are aquatic, and have gills for respiration; they undergo metamorphosis to the adult form.If sliding on a plastic saucer is your idea of downhill fun, the best sledding hills in America have plenty of snowy slopes to navigate with the aid of gravity.acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large muscles of a weightlifter).The amnion surrounds the embryo with a watery substance, and is probably an adaptation for breeding on land.amphibians: The class of vertebrates that contains the frogs, toads, newts, and salamanders.Within a population there may be many different alleles of a gene; each has a unique nucleotide sequence.
amino acid sequence: A series of amino acids, the building blocks of proteins, usually coded for by DNA.adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment.Also used to describe the process of genetic change within a population, as influenced by natural selection.If such a behavior is even partly genetically determined, it will tend to become widespread in the population.
Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.Pyeongchang is a small city in the mountains of South Korea, host to the XXIII Olympic Winter Games on Feb. Tickets and accommodation packages are on sale, exclusive of airfare, through the official U. Face the chilly challenge prepared with all the essential clothing, equipment, and gear and go to the right places to be rewarded with plenty of fish.