Phytoplankton – microscopic plants (algae) that float or swim in water. The sunlight can only penetrate into the first 60 metres of clean water for most of these plants to grow.
Polyp – small simple creature with a mouth, gut and tentacles. It has no brain, eyes heart or blood vessels.
Radula – rasping teeth in the mouth of seashells.
Symbiotic relationship – describes two unrelated organisms that live with each other and both obtain benefits from their relationship.
Ultraviolet radiation (UV) – very short wavelengths of light (radiation) that can damage living organisms.
Weather – describes the changes in rain, sun, cloud, wind, temperature etc. form hour to hour, day to day and month to month.
Zooplankton – simple microscopic animals that feed on phytoplankton (microscopic algae) or even smaller zooplankton. These tiny animals are the essential link to feed the animals further up the food chain.
Zooxanthellae – a particular group of microscopic algae that can live and swim freely in the sea and also live in the cells of coral polyps and clams.