Which statement best describes why the immune system does not attack cancer cells?
oncogenes can out-smart the immune system by creating a protective coat.
the immune system recognizes the cancer cells but they grow to fast to overcome.
the immune system does not recognize the cancer cell because it is not foreign.
the immune system is suppressed by the cancer and does not work properly.

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;

during longer space exploration trips, crewmembers may develop vision impairment risks and short-term cardiac atrophy or a decrease in the size, strength, weight, and activity of the heart during space flight because they can experience microgravity. in addition, the long-term medical condition is loss of bone mineral density and radiation exposure.