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delicate in nature and are easily damaged or maymenteu. Tmey ule uisu prey to mel seu animais such as sponges and clams that bore into the skeletal structures and weaken them.
4.Coral colonies cannot build reef structures without considerable assistance. The many openings in and among the skeletons must be filled in and cemented together by material from around the colonies. The filling material often consists of fine sediments created either from the borings and waste of other animals around the coral or from the skeletons, shells, and remnants of dead plants and animals. The material that is used to cement the coral reefs comes from algae and other miscroscopic forms of seaweed.
5. An additional part of the process of reef formation is the ongoing compaction and cementation that occurs through the process. Because of the soluble and delicate nature of the material from which coral is created, the relatively unstable crystals of corals and shells break down over time and are then rearranged as a more stable form of limestone.
6.The coraline structures that are created through these complicated processes are extremely variable in form. They may, for example, be treelike and branching, or they may have more rounded and compact shapes. What they share in common, however, is the extraordinary variety of plant and animal life-forms that are a necessary part of the ongoing process of their formation.
1) In the passage, what is suggested as the reason for the initial misconception that corals were plants?
A. The clustered petals resembling flowers
B. The delicate and skeletal nature of coral structures
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C. The rapid reproduction of coral colonies
D. The appearance of tentacles on individual polyps
2) Based on the information provided, why are coral colonies limited to specific geographical regions?.
A. They cannot endure the effects of external natural forces a substantial quantity of natural light.
B. They require C. They reproduce quickly in tropical waters.
D. They require water temperatures above 90°F.
vant fini
