Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells.
The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.
The vaccine was made in the past year, and the flu virus has mutated and grown resistant to this year's flu vaccine
When a phosphate group is removed from the molecule
