Answer:
Hemoglobin!
Explanation:
Hemoglobin is the component that carries O2 in blood. Very important for the body!
Transfer of fluid trough cell membrane without use of ATP energy, where fluid goes from hypotonic to hypertonic surrounding for the purpose of balancing fluid:mineral ratio of both inside and outside of cell.
A.) Angiosperms have flowers that attract organisms like insects, which aid in fertilization.