Six years after invading manchuria, japan invaded in 1937. russia korea or china

  China

Explanation:   Japan attacked China on July 7, 1937. The attack was preceded by an incident at the Marco Polo bridge, which turned out to be a battle. The conflict lasted until September 2, 1945, and during this conflict, China was assisted by the Soviet Union and the United States. This Chinese-Japanese war was the largest Asian war in the 20th century. Human casualties in this conflict are considered to be the majority of civil and military casualties in the Pacific War.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.