Answers

2015-03-02T20:03:28+08:00

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Azolla is used as a rice biofertilizer 1500 years ago and because of its nitrogen-fixing bacteria.
0