[Pelham]

That may all be true, but how did the Cvirus gain segments of the HIV virus?

They shared similarities from the start. This is a paper from Sept 2003 right after the first SARS virus burned out. Covid-19 is caused by the SARS-CoV-2 virus.

Cloaked similarity between HIV-1 and SARS-CoV suggests an anti-SARS strategy

How did it gain spike proteins that unlock two types of human cells while existing in animals?

You can read about that here:

The proximal origin of SARS-CoV-2

[chris37]

Thank you, I appreciate the links very much. I will read them.