Vestigial structures, remnants (leftovers) from when an ancestor long ago used the structure, homologous structures, similar structures with different functions, analogous structures, different structures with a similar function, embryology , developing babies very early on from several different animals show that they all had a common ancestor at some point, antibiotic resistant bacteria, prokaryotes have developed a trait that allows them to survive and reproduce in an environment with penicillin., Alexander Fleming , Discovered penicillin in 1928, Charles Darwin, Responsible for the early work on evolution., Gregor Mendel, Responsible for early work on genetics using pea plants, Animal Factories, Responsible for the largest use of antibiotics., DNA, Sides contain alternating sugar and phosphate molecules., Proteins, Made of a chain of amino acids joined together via dehydration synthesis., species, Organisms that can reproduce and have babies that can reproduce., Liger, The occasional result of two different species producing a baby that can not have babies of its own. , adaptation, a trait that allows an organism to survive and reproduce in its environment., fitness, the ability to survive and reproduce in its environment., chimps, 99% similar DNA, caveman, an early ancestor of humans, genus and species, makes up the scientific name of any organism.

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