Plant needles are PROBABLY initially the result of A) adaptations for survival that some plants developed due to high temperatur
es on Earth. B) somatic mutations that made some leaves thick and waxy, while other leaves did not change. C) neutral mutations to leaf tissue that would neither help nor harm the plants living in such a harsh environment. D) a beneficial mutation that increased survival of certain plants that reproduced and passed the mutated gene to offspring.
Red blood cells contain enormous amounts of a protein called hemoglobin. This iron-containing molecule binds oxygen as oxygen molecules enter blood vessels in the lungs. Hemoglobin is also responsible for the characteristic red color of blood.
