The writing materials,the envelopes and the stamps are all made of paper and this led to a great waste as the papers have to be disposed after use. This is not the case with electronic mails. Electronic mails do not need paper at all and it has drastically reduce the amount of papers that is used in writing letters.
I hope this helps :)
The amswer would be B beaucause the excretory system could ger rid of soild and waste
Bacteria can be beneficial. The example of how bacteria are beneficial is that they A. break down cellulose in some animals' digestive systems.
