Like most plants, algae produce oxygen and take up nutrients while they are growing, but when they die and decay they can release nutrients.
(algae; produce; oxygen) (algae; take up; nutrients; T:while they are growing) (they; are growing; ) (they; die; ) (they; decay; ) Context(they decay,List([94, 112))):(they; can release; nutrients)
they decay,List([94, 112))
algae algae they they they they
produce take up are growing die decay can release
oxygen
nutrients T:while they are growing
nutrients