海綿動物門和扁盤動物門-資料下載頁
2025-05-11 07:09本頁面
【正文】 ts cells, similar to species of bacteria, rather than other metazoans. T. adhaerens is a marine animal, but it is very seldomly recognized or identified and its known distribution reflects the distribution of marine biology research stations rather than its true geographic distribution. It feeds on protozoans which it covers with its body and then secretes digestive enzymes onto, the resulting nutrients are absorbed by the same cells that secretethe enzymes. Reproduction can be asexual by either binary fission or budding and accidental cutting of the body into several parts results in each part being a new smaller placozoan. Eggs and sperm are known to be produced but nothing else is currently known about its sexual reproduction. 作業(yè) 1. 海綿動物的體型 、 結構有何特點 ？ 根據(jù)什么說海綿 動物是最原始 、 最低等的多細胞動物 ？ 2. 為什么說海綿動物是多細胞動物進化中的一個側枝 ？ 3. 描述海綿動物的體壁結構與機能 ？ 。 5. 海綿動物門分為哪幾個綱 ？ 它們之間的主要區(qū)別是什 么 ？ 6. 初步了解扁盤動物的結構與功能的特點 。
黨政相關相關推薦
鄂ICP備17016276號-1