Reef Structure
According to atoll theory, coral reefs begin forming around this type of landform.
What is a volcanic island?
This free-swimming, bell-shaped body form has the mouth facing downward.
What is a medusa?
The central cavity of a sponge through which water flows is called this.
What is the spongocoel?
This part of the reef receives the strongest wave action and forms the outer ridge of the reef.
What is the reef crest?
This type of reproduction occurs when polyps produce new individuals by budding.
What is asexual reproduction?
Sponges can also reproduce asexually by this method, producing small buds or internal survival
What are budding or gemmules?
The chemical formula CaCO₃ represents this compound that makes up most coral reef structures.
What is calcium carbonate?
This class of cnidarians includes corals and sea anemones and exists only in the polyp stage.
What is Anthozoa?
Coral reefs require fairly stable levels of this property of seawater, usually around 34–37 parts per thousand.
What is salinity?
This bell-shaped structure contracts rhythmically to move jellyfish through the water.
What is the bell?
High levels of this water condition—caused by suspended sediments—reduce sunlight and harm reef growth.
What is turbidity?
This internal cavity is where digestion occurs in jellyfish.
What is the gastrovascular cavity?