Nucleotides. They are the building blocks of DNA.
1. The separation of a substance into simpler substances or basic elements. 2. The process of decaying or rotting. Decomposition of dead organic matter is brought about by the activity of certain bacteria and fungi feeding on it.
Xylem transports and stores water and water-soluble nutrients.
Phloem transports sugars, proteins, and other organic molecules.
A. Ancestors of whales may once have been able to walk.
The answer is the muscular system
