Fill in the blanks: a. Microorganisms can be seen with the help of a ____________. b. Blue green algae fix __________ directly from air to enhance fertility of soil. c. Alcohol is produced with the help of __________. d. Cholera is caused by __________.

Answers (1)

(a) microscope,
(b) nitrogen,
(c) yeast,
(d) bacteria

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