12. In what direction does blood flow through the heart? A. Up and down
B. Right to left
C. Slow then fast
D. Fast then slow

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

How is transcription similar to translation in terms of base pairing?

Diagram of the evolution of land plants?