Well a group of organs that work together is called a system. For example the digestive system (stomach, liver, esophagus, small intestine, large intestine, gall bladder), also the endocrine system... :)
Cooperation helps because they both defend each other. its a friendship that allows for living longer. For example, Near sharks, fish stay behind them, so that they are not killed, thats one example.
Scientists are preserving the DNA for research.
Answer:
From other seeds
Explanation:
They grow more seeds form the one seed
Answer:
Adenine, Guanine, Cytosine, Thymine