Hydrogen, Carbon, Nitrogen, and Oxygen all make up amino acids.
Answer: Plants are cloned to produce identical plants quickly and economically.
The organelle is called mitochondria, the energy molecule is ATP
In bone growth, the medullary cavity is enlarged because of the activity of osteoclasts. These are cells working to break down bone, resorbing old bones which will line in the medullary cavity. The cavity is also enlarge as the cells contribute to the increase in length and diameter of a growing bone.