Order Tramadol Online Mastercard Parasites are usually smaller organisms that live on a larger organism. Rather than have to kill for food, although if they get out of control it can be dangerous in some circumstances, they co share the environment of the host. The host is the organism they live off.

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follow Some parasites are vectors, specifically in this context a vector is an organism, often a biting tick or isect that transmit a sickness or microform from one organism to another.