I'm supposed to find the answer to this in a short video but no matter how many times I listened to it, I couldn't find the second answer (Got the first easy enough though.)... What three things affect the growth of phytoplankton? So, I decided to try to look the answer up myself. Is this right? Light absorption, phosphate absorption, annndd...ah, I haven't found the third one yet so I'll guess. Nutrient absorption?