What Is Coral? The corals that form reefs aren’t rocks or plants. Corals are made up of groups of tiny animals called polyps (PAH-lips). Most polyps are smaller than a pea. Thousands of polyps can live on a piece of coral. Where Do Corals Live? Coral reefs need certain living condi...
coral polyps D. sand and gravel 相关知识点: 试题来源: 解析 C。本题考查大堡礁的组成。A 选项 ice and snow 冰雪,大堡礁在热带海洋,没有冰雪;B 选项 rocks and stones 岩石和石头,大堡礁主要是由珊瑚虫组成;D 选项 sand and gravel 沙子和砾石,不是大堡礁的主要组成部分。C 选项 coral polyps 珊瑚虫,...
What is a polyp's exoskeleton made of? Polyps: A polyp is an individual organism that lives in a colony composing a coral reef. When they first hatch, millions of larval polyps float in the ocean until they attach themselves to the ocean floor. ...
Each coral species lays down its skeleton in a different way.This gives rise to the extraordinary range of shapes and forms that hard corals take.Some form large boulders, where the polyps live in small, isolated depressions or grooves in the skeleton.Some grow in branches, which can be smal...
Coral reefs would not exist if it were not for the ability of coral polyps to secrete limestone or calcium carbonate. Sea water surrounding a coral is very rich in dissolved calcium carbonate, but the fluid inside the polyp cannot retain a large quantity of calcium carbonate, so it is laid...
The Great Barrier Reef is mainly composed of___. A. coral polyps B. volcanic rocks C. sandstone D. marble 相关知识点: 试题来源: 解析 A。解析:大堡礁主要由珊瑚虫组成。选项 B 火山岩不是大堡礁的主要组成部分。选项 C 砂岩也不是大堡礁的主要组成部分。选项 D 大理石更不是大堡礁的组成部分。反馈...
E This reef structure is made up of and built by billions of tiny organisms,known as coral polyps(珊瑚虫). The Great Barrier Reef supports a wide diversity of life, and was selected as a World Heritage Site in 1981. A large part of the reef is protected by the Great Barrier Reef ...
初三英语完形填空2篇,1.A Coral ReefA coral reef (堡礁) is made up of millions of tiny sea creatures called polyps (水螅).When they die,they ___1___ behind a hard white skeleton (骨架).The living coral polyps (珊瑚虫) build upon these
be dangerous to ships. Eventually new islands are formed by the accumulated skeletons of billions of dead polyps.But the romantic coral islands and reefs of the South. Seas do not supply the precious material used for beads and brooches They are made from ...
polyps grow together until they form a colony, and it is this colony that we recognize as a coral. There aretwo types of coral: hard corals and soft corals. Hard corals, also known as stony corals or more formally asScleractinians, secrete calcium carbonate to form a hard skeleton; it ...