Bell and collaborators painstakingly documented a population of fossil sticklebacks from an ancient freshwater lake over a 20,000-year period. The prevalence of sticklebacks with full and reduced pelvises changed over time. Which is true?1. Initially (time A), fish with full pelvises dominated the lake population.2. By the end of the studied period (time D) there was an approximately equal number of sticklebacks with and without spines.3. In this population, having pelvic spines seemed to provide a selective advantage to stickleback fish.4. The evolution of pelvic reduction seen in the fossil record is different from the phenomenon occurring in the lakes in Alaska today.5. The population of fish with pelvic spines that arrived in the lake at time B evolved a reduced pelvis over time (beginning at time C).
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Biology, 21.06.2019 19:30, AaronEarlMerringer
Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.
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Biology, 22.06.2019 03:30, lildanielmabien
How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures
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Biology, 22.06.2019 03:30, maloynegen7681
Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what
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Bell and collaborators painstakingly documented a population of fossil sticklebacks from an ancient...
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