anjoliestar10 anjoliestar10

07-06-2021
English

contestada

The Keeling curve shows that carbon dioxide concentration in Earth's atmosphere
reached _____ ppm in 2013.
a) 250
b) 300
c) 350
d) 400

Respuesta :

hcwvyb6gqj hcwvyb6gqj

07-06-2021

The answer is c) 350 I’m pretty sure

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