Pathogens or parasites?Watch
A parasite is an organism that steals nutrients from its host and may harm it.
If this is inaccurate please use google.
Hope I helped.
© Copyright The Student Room 2017 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE