Identity 20 scientists, their place of origin, year and significant contribution to the study of micro biology

632–1723Anthonie van Leeuwenhoek (1632-1723). Natuurkundige te Delft Rijksmuseum Antonie van LeeuwenhoekDutchConsidered to be the first acknowledged microscopist. Van Leeuwenhoek was the first to observe microscopic organisms, using simple single-lensed microscopes of his own design.[1]

1729–1799 Lazzaro SpallanzaniItalianProved that bacteria did not arise due to spontaneous generation by developing a sealed, sterile broth medium.[2][3]

1749–1823Edward Jenner  Edward JennerEnglishDeveloped vaccination techniques against smallpox.[2]

1818–1865Ignaz SemmelweisIgnaz SemmelweisHungarianDemonstrated that doctors washing their hands with chlorine solutoin significantly reduced mortality of women giving birth in the hospital setting.[4]

1853–1938Hans Christian Gram portrait  Hans Christian GramDanishDeveloped the Gram stain used to identify and classify bacteria.[2]

1845–1922Charles LaveranCharles LavaranFrench1907 Nobel Prize in Physiology or Medicine for discovering the causative agents of malaria and trypanosomiasis.[2]

1827–1912Joseph Lister  Joseph ListerEnglishIntroduced sterilisation techniques to surgery.[2][5]

1822–1895Louis Pasteur, foto av Paul Nadar, Crisco  Louis PasteurFrenchSeminal discoveries in vaccination, food safety, and microbial fermentatoion. A key proponent of the germ theory of disease.[2]

1850–1934Fanny HesseGermanDeveloped agar for use in culturing bacteria.[2][6]

1851–1934 Martinus BeijerinckNetherlandsDiscovered the first virus as well as bacterial nitrogen fixation and sulfate reduction.

1885–1948  Marjory StephensonBritishPioneer of bacterial metabolism.

1871–1957Kiyoshi ShigaJapaneseDiscovered a bacterium causing an outbreak of dysentery.[2][7]

1854–1917Emil Adolf von BehringGerman1901 Nobel Prize for Physiology or Medicine for discovering diphtheria antitoxin.[8]

1857–1932Sir Ronald RossBritish1902 Nobel Prize in Physiology or Medicine for discovering that malaria is transmitted by mosquitoes[9]

1843–1910Robert KochGerman1905 Nobel Prize in Physiology or Medicine for work on tuberculosis; identified causative agents of tuberculosis, cholera, and anthrax.[10]

1845–1922  Charles Louis Alphonse LaveranFrench1907 Nobel Prize in Physiology or Medicine for recognizing parasitic protozoa as the causes of malaria and African sleeping sickness.[11]

1857–1940  Julius Wagner-JaureggAustrian1927 Nobel Prize in Physiology or Medicine for discovering the neurosyphilis could be treated by inducing fever with malaria parasites.[12]

1866–1936  Charles Jules Henri NicolleFrench1928 Nobel Prize in Physiology or Medicine for determining that typhus is transmitted by body lice.[13]

1895–1964  Gerhard DomagkGerman1939 Nobel Prize in Physiology or Medicine for the discovering the first commercially available antibiotic: prontosil.[14]

1881–1955  Sir Alexander FlemingScottish1945 Nobel Prize in Physiology or Medicine for discovering penicillin.[15]

1906–1979  Sir Ernst Boris ChainBritish

1898–1968Howard Walter FloreyAustralian

1899–1972Max TheilerSouth African1951 Nobel Prize in Physiology or Medicine for developing a vaccine against yellow fever.[16]

1888–1973Selman Abraham WaksmanAmerican1952 Nobel Prize in Physiology or Medicine for identifying streptomycin and other antibiotics.[17]

(I really hope this helps you out!)

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.