23 November 2011
Some Microorganisms are Harmful and Some are Useful
(a) Microorganisms can be
useful
or
harmful
.
(b) Useful microorganisms can be used in making food.
(c) Harmful microorganisms cause diseases.
No comments:
Post a Comment
Newer Post
Older Post
Home
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment