How may the carbon cycle be altered after a large scale reforestation effort select all correct answers
a) atmospheric carbon dioxide levels would decrease because the new trees would absorb carbon dioxide during photosynthesis
b) atmospheric carbon dioxide levels would stay the same because the new trees would absorb as much carbon dioxide as they produce
c) atmospheric carbon dioxide levels would decrease as trees grew larger and more carbon was stored in wood
d) atmospheric carbon dioxide levels would increase as new trees allowed ecosystems to support an equal number of new animals