Answer:
During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose.
Explanation:
Absorption of light electron transport leaning to the reduction generation of ATP and conversion of CO2 into carbohydrate
I am not 100% sure but I thinking it responds when pathogens enter the body because the immune system is meant to protect your body from illness.
B is your answer and explanation because I know ;)