Purines; like adenine and guanine.
Answer:
Body systems. Our bodies consist of a number of biological systems that carry out specific functions necessary for everyday living. The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide, and hormones, around the body. It consists of the heart, blood, blood vessels,arteries and veins.
Little Rock is right in the middle of the state so to figure out where the storm will go next you need the direction of the wind
B migration, that is the answer