Answer:
the trend that favor the more leaning curve from the explanation
A. The oceans.
That is because oceans absorb more than a quarter of the carbon dioxide that humans produce.
Hope that helped.
B. Because of the presence of hydrogen sulphide in Brass, it combines with oxygen in air and form water, evaporates. So remained sulphide is colourless in air .So Brass gets discoloured in the air.
Animal cells contain dna enclosed in the nucleus
