help i have this homework and need to find out where substances come from and how do they get to the cell
If by respiration you mean breathing, the substance coming in is oxygen.
The substances that are needed for cellular respiration are glucose and oxygen. During cellular respiration, the cells convert food into usable energy.
Glucose and oxygen are needed for respiration. All other substances are not needed.
Gulcose
oxygen is used up in respiration.
Glucose and Oxygen
oxygen
blood cells
oxygen and glucose
Respiration
oxygen and glucose
Glucose and oxygen are used up during respiration.