If their data they collected from their experiment proved their hypothesis correct, then yes, their supported hypothesis can be called a scientific theory.
Answer: Plants, from their roots, suck up nitrogen compounds. These compounds are obtained by animals as they consume plants. The nitrogen compounds in the organic matter re-enter the soil when plants and animals die or when animals excrete waste, where they are broken down by microorganisms, called decomposers.
I think the answer for this Question is DNA
Answer:
Viruses are composed of one or more cells.
Explanation:
The viruses are microorganisms composed of genetic material protected by a protein envelope, and that´s how they work and live. This protein membrane, (only present in some viruses), is carbon based.
By they way of fuction, they evolved along whit the cell in wich they are introduced, since they reproduce with it.
There is also evidence that they may not have the same capacity to multiply as embryonic stem cells do. Hope this helps :)