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a scientist attempts to determine the effect of varying concentrations of ammonia on a bacterial culture. several cultures of the
same species of bacteria were grown in culture tubes, each with a different concentration of ammonia. the cultures were
incubated (kept in a warm, safe environment) and after 24 hours the cultures were examined for bacterial growth.
to improve this experimental design, the scientist should have included a control group which
a
contained no ammonia
b
contained no bacteria
с
was not incubated
d
was incubated at room temperature
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Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

The accompanying figure shows the percent of selected dna sequences that match between a chimpanzee and other primates. these data support the hypothesis that the figure shows the percentage of selected d n a sequences that match between the chimpanzee and other primates. the human has an almost 98 percent match, the gorilla has an almost 97 percent match, the orangutan has a 96 percent match, the gibbon has an almost 95 percent match, and the old world monkey has an almost 92 percent match. the accompanying figure shows the percent of selected dna sequences that match between a chimpanzee and other primates. these data support the hypothesis that the figure shows the percentage of selected d n a sequences that match between the chimpanzee and other primates. the human has an almost 98 percent match, the gorilla has an almost 97 percent match, the orangutan has a 96 percent match, the gibbon has an almost 95 percent match, and the old world monkey has an almost 92 percent match. chimpanzees and gibbons are the most closely related the chimpanzee's closest surviving relative is humans orangutans are the primates least closely related to chimpanzees old world monkeys and gibbons are the most closely related

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim