Although Azolla can absorb nitrates from the water, it can also absorb ammonia secreted by Anabaena within the leaf cavities.
(Azolla; can absorb; nitrates; from the water) (it; can also absorb; ammonia secreted by Anabaena; T:within the leaf cavities) (ammonia; secreted; by Anabaena)
Azolla it ammonia
can absorb can also absorb secreted
nitrates from the water
ammonia secreted by Anabaena T:within the leaf cavities
by Anabaena