I believe it is A. Primary succession starts with plants and rocks.
The answer is B. Speed up chemical reactions. Hope this helps.
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:
uracil
Explanation:
guanine is the other DNA base