Answer:
C. Geothermal
<em>I Hope im correct ^^</em>
A cell maintains homeostasis through division and repair. The cell cycle has three, stages that are used to help a cell maintain homeostasis. Photosynthesis in a plant cell makes glucose and oxygen for the cell. Then the cell uses that glucose and oxygen to do cellular respiration for the cell to live and function.
Answer:
Stomata takes in water,sunlight,and dioxide and release oxygen.
The nervous system regulates parts of the body to maintain homeostasis or a balance within the body.
I assume here that you mean the transcription of DNA to RNA (which already answers your question! the source is the DNA!) DNA is the genetic code kept in the nucleus. It must be copied (transcription) to RNA which caries to the ribosomes, which will read the code.