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In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria. In the 1890s, Dmitri Ivanovski filtered extracts from diseased tobacco plants and discovered that the
asked
Nov 11, 2017
Biology
high-school
2
answers
3
votes
213k
views
When a peptide hormone reaches its target cell, which event happens next?
asked
Mar 7, 2017
Biology
high-school
1
answer
2
votes
114k
views
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