It depends on which virus you are referring to specifically. Viruses come in many shapes and types; their variations are tremendous.
For HIV and Influenza, viruses acquire their envelops after maturation, during the budding off or detachment stage from the host cell.
Hope this helps! :)
Answer:
All of the above
Explanation:
The definition of ecosystem is "a biological community of interacting organisms and their physical environment." and all four of the answers fit the bill.
The smallest particle of an element is an atom
It is the disulphide bond.
