Question

an organic nutrient that cannot be synthesized by the organism and must be provided is called a(n) _________.
growth factor
trace element
macronutrient
micronutrient

Explanation:

Growth factors are organic nutrients that an organism cannot synthesize on its own and must obtain from the environment. Trace elements are inorganic and usually in very small - amounts. Macronutrients and micronutrients can be either organic or inorganic, but the key here is the inability to synthesize, which defines growth factors.

Answer:

growth factor