Algae Like plants, but more simple in composition, algae can take up carbon dioxide from the surface air (although a few do it deep in the soil) and convert it to oxygen as part of their food production process.
(algae; can take up; carbon dioxide from the surface air) (a few; do; it; L:deep in the soil) (a few; convert; it; to oxygen)
algae a few a few
can take up do convert
carbon dioxide from the surface air
it L:deep in the soil
it to oxygen