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$I.$ Communication was not easy
$II.$ Concept of factors which did not blend was not accepted
$III.$ Use of mathematics to explain biological problem was unacceptable
$IV.$ He could not provide any physical proof for the existence of factors Choose the right combination
$I.$ Antibiotics are chemical substances produced by some microorganisms which can kill or retard the growth of other disease-causing microorganisms
$II.$ Penicillin is the first antibiotic discovered by Alexander Fleming $(1928),$ while working on bacterium Staphylococcusaureus
$III.$ The function of penicillin as an antibiotic was established by Ernst chain and Howard Florey
Which of the statement given above are correct?