As far as I can tell, Biden didn't control Congress. Senator Manchin, for example, effectively watered down the Build Back Better Act that Biden advocated for — and, to my knowledge, Biden never threatened him or any other Democratic members of Congress who resisted his legislative plans with “political consequences”, as Trump is doing to Republican House representatives in this instance.
In establishing himself as the Republican presidential candidate for the 2024 election, Trump seems to me to have set up a sort of cult of personality within the party such that Republicans either fall in line or out of favor.
That article is a sobering read. I wasn't aware of the extent of the spread and thank you for sharing it.
That is indeed a theory, hypothesized in a paper from 2005 and mentioned on the Wikipedia article about the Spanish flu:
[I fact-check as much as my time and preexisting knowledge allow. I post what I found to vouch for your comment and save other people time. I hope I don't come across in the wrong way.]
There are no penguins in the Arctic and the article you linked to doesn't mention them. Where has bird flu infected penguins?