Was the ancient isthmus that connected present-day alaska to northeastern russia. a. beringia b. florida c. nova scotia d. pangaea

I believe its A) Beringia

Hello!

Beringia is the ancient isthmus that connected present-day Alaska to northrastern Russia. Beringia was exposed land from the bottom of the Bering Sea that allowed for passage around Siberia and Alaska.

The reasons why it cannot be in the other answers are because:

Florida is a state in far south eastern corner of the United States, which is the diagonal opposite of Alaska.

Nova Scotia is a province again on the far eastern side of Canada.

And Pangaea was the supercontinent that assembled around 335 million years ago and later disassembled in 175 million years ago.

Hope this helps answer your question!

angel island immigration station was an immigration station located in san francisco bay which operated from january 21, 1910 to november 5, 1940,[4] where immigrants entering the united states were detained and interrogated. angel island is an island in san francisco bay. it is currently a state park administered by california state parks and a california historical landmark. the island was originally a fishing and hunting site for coastal miwok indians, then it was a haven for spanish explorer juan manuel de ayala. later, it was developed as a cattle ranch, then, starting with the civil war, the island served as a u.s. army post. during the island's immigration station period, the island held hundreds of thousands of immigrants, the majority from china, japan, india, mexico and the philippines. the detention facility was considered ideal because of its isolated location, making it very easy to control immigrants, contain outbreaks of disease, and enforce the new immigration laws.[5] the station is listed on the national register of historic places under the title angel island, u.s. immigration station, and is a national historic landmark. the station is open to the public as a museum – "a place for reflection and discovery of our shared history as a nation of immigrants”.

hope this

true

explanation: