Given a scientific question, generate a correct answer to it.

Example Input: Who created the idea of an evolutionary tree to represent the relationships between different species and their common ancestors?
Example Output: charles darwin

Example Input: What is the wavelength of light expressed in?
Example Output: nanometers (nm)

Example Input: What do we call the recycling of inorganic matter between living organisms and their environment?
Example Output:
biogeochemical cycle