Charles Keeling's work at the National Oceanic and Atmospheric Administration (NOAA) Mauna Loa Observatory paved the way to understanding how human activities can lead to global warming.
Which greenhouse gas did Charles Keeling measure at the observatory?
A)
carbon monoxide
B)
methane
C)
nitrous oxide
D)
carbon dioxide

2%? i tried finding the exact sorry if it's not 100% correct ; -;

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.

i think that it is c, d, and e, hope this