There is a magical ocean community in Alipay Ant Forest with novel gameplay and rich content. There is also an ocean knowledge popularization center, which will update new questions every day. As long as users choose the correct answer to complete the answer, they can not only learn, but also receive rewards. Kill two birds with one stone.
carbon dioxide
Mannitol
Answer: Mannitol
Brown algae belong to the phylum algae. The color of the algae varies greatly due to the different proportions of various pigments contained, ranging from yellowish brown to dark brown. There are often white particles in the cells called fucoidan vesicles. The products of its photosynthesis are laminarin and mannitol.