They would be conecting at the site of the injury.
Human immunodeficiency virus. (HIV)
Aids are a infectious agent.
It spends by any contact. ex: sex, hands, and any contact.
If someone has these diseases, they need to contact a doctor ASAP, and get treat. (some diseases can be controlled but not heal, meaning can NOT go away)!
A scientist may use molecules - enzymes, proteins, DNA, RNA - to test for similarities, because if anatomy alone was used, it would be difficult to link traits and characteristics between the two organisms. For example, a rabbit has an endoskeleton and a closed circulatory system, while a fly has an exoskeleton and hemocoel.
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