But it was not until 1928 that penicillin, the first true antibiotic, was discovered by Alexander Fleming, Professor of Bacteriology at St. Mary's Hospital in London.
Answer:
4 the cube with many circles in it or box C
3 objects that float paperclip, feather, air molecules, sticker objects that sink book, phone, human, plate.
2 ?
Explanation:
Answer:
None of the above
Explanation:
<h3>Because as N has the valence of 3 when it reacts with Cl of 1 as valence they will form NCl3</h3>
