Are hypoxia and eutrophication the same thing ?

Eutrophication is the over enrichment of waters by nutrients -- threatens and degrades many coastal ecosystems around the world. The two most acute symptoms of eutrophication are hypoxia (or oxygen depletion) and harmful algal blooms, which among other things can destroy aquatic life in affected areas.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex