Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? O130 million years ago O1.5
billion years ago O2.5 billion years ago 
1 answer:
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Answer:
A. Danube
Explanation:
The river shown by number 1 is the Volga.
The river shown by number 2 is Ob.
Rover shown by number 3 is Lena.
<u>These three rivers all flow through Russia. The Danube is not shown in the picture – it does not pass through Russia at all, and it is Russia and its rivers that are depicted in the image.</u>
The Danube flows through the European countries located West of Russia. It starts in Germany, going through Austria, Slovakia, many Balkan countries, Moldova and Ukranie. In the end, it goes in the Black Sea. It is the second-longest European river, after the Volga, and it flows for 2850km.
