He did not take in to account for wind currents and the fact that CO2 or the carbon stays in the air
The answer is external stimulus
In the development of a cancer cell, the formation of new blood vessels is called Angiogenesis, option B. When tumors are present in the body, circulation and the distribution of nutrients in the body is altered; thus, resulting in different kinds of disorders associated with cancer. With the presence of cancer, these tumors need more nutrients to spread and grow, which results in the formation of more blood vessels.
B) Rust, because it has tightly arranged hyphae
