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Nitrate,nitrite,Ph,temperature and amonia..
it rains
Pacemaker batteries must be checked regularly. Some pacing systems allow patients to monitor battery life through a special telephone monitoring service that can read pacemaker signals.
Plankton
buffer systems
POLLUTION!
Monthly fees for monitored emergency alert systems ranges from free to $20 a month. ADT can even build them in as a feature your home security system.
they are aquirum aquatic
The most common type of surveillance system is a video sytem, either self-monitored or monitored remotely by a company. Other forms of surveillance systems include audio and internet monitoring.
Target hardening
It is not easy to compare terrestrial and aquatic systems because there is such on the similarities and differences between terrestrial and aquatic ecosystems.
The respiratory system of most non-aquatic animals is entirely enclosed in the human body and connected with the lungs. Many aquatic animals have developed open respiratory systems that include features like the gills.