I think it’s D. H2, NaCI, CO
(1) start with an effect and work backward to an explanation (2) do not recognize social and cultural influences, and (3) absolve people from taking responsibility for their sexual behavior.
Photosynthesis, because the equation is using light energy and producing oxygen, like a plant, which use photosynthesis to make food.
If she is O+ then others of O+ and O- can donate to her. If she is O- then only those with O- can give blood to her.
