1. 1940
2. 1950
3. 1960
4. 1970
The celebration of the first "Earth Day" could be placed in the timeline represented by what number?
Responses
A 2
B 3
C 4
D 5
2. 1950
3. 1960
4. 1970
The celebration of the first "Earth Day" could be placed in the timeline represented by what number?
Responses
A 2
B 3
C 4
D 5