Fish,hawk,sparrow and heron
You have not given the concept map. But I think it might be this one. So, according to this concept map, the answer should be B. H2O and CO2
I believe it is keeping these regions warm because the water is flowing from the SOUTHERN part of these regions, like, how it starts from the bottom of the US, (aka Louisiana, Mississippi), and it gradually flows upward, but hot always overrules cold, so the cold water that it is flowing into is becoming warmer as it passes into the warm water from the gulf of Mexico.
Hope that this helps :)
.5 of a micrometer in width
2 micrometers in length