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Charles Darwin, born in 1809, was a great biologist   16  _____________ is best known for his theory about the evolution of plants and animals. During a five year journey on a naval survey ship, HMS Beagle, Darwin visited the Galapagos Islands off the coast of South America. There he saw plants and animals   17  _____________were found nowhere else in the world. Darwin knew that even animals of the same type had slightly different features. He suggested that the animals   18  _____________ features made them best suited to their surroundings were most likely to survive. Therefore, these features would be passed on to their young. In this way a population of animals would slowly change or evolve.Darwin published his ideas in 1859 in The Origin of the Species. The book caused an uproar and many people didn’t understand   19  _____________ Darwin was saying. They thought, wrongly,   20  _____________ he was claiming that humans had descended directly from apes. Darwin died in 1882, aged 73.
16.    A      who      B      whose        C      that D      what
17.    A      whose     B      which         C      who D      whom
18.    A      what      B      who’s         C      whose        D      who
19.    A      what      B      that      C      which         D      who
20.    A      whose        B      what      C      who D      that