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C. Lobe-finned fish radiated into almost all available aquatic habitats. D. During the Devonian, lobe-finned fish were more common in marine than in freshwater habitats. 你的答案: 正确答案:B 题目解析: 登录 后才能查看题目解析,还没有账号? 马上注册 推荐文章: 【托福阅读】Official 36-P2 深海...
all but the most primitive have bilateral symmetry-the left sides of their bodies are roughly mirror images of the right sides. Two main groups of animals have radial symmetry instead. One of these groups is jellyfish, which are extremely primitive...
One of these groups is jellyfish, which are extremely primitive and are assumed never to have evolved bilateral symmetry The other radially symmetrical group is the echinoderms, which are fairly sophisticated. In fact, biologists know that the echinoderms did once have bilateral symmetry because the...
(fin of fish, wing of bird) look similar but not same analogous structures explained the common occurrence of the homologous physical, structure ( how and embryo grows) pharyngeal slits exist in these 5 vertebrates animal this is evidence that all 5 evolved from a common ancestor ...
5個月前建立 這個學習集的練習題 學習 1 / 7 snail and sea slugs 選擇正確的詞語 1 Anthozoa 2 grastropoda 3 Diplopoda 4 Scyphozoa 本學習集中的詞語(21) Porifera sponges Scyphozoa jellyfish Anthozoa sea anemones and corals Turbellaria free-living flatworms ...
7.Paleontologists are always attempting to determine evolutionary relationships among organisms. One widely accepted hypothesis is that echinoderms are closely related to vertebrates-the group of animals that includes fish, reptiles, and mammals. Although adult echinoderms do not resemble vertebrates biologist...
1.Paragraph 1 supports which of the following statements about fish evolution? A. Lobe-finned fish were among the earliest types of fish to appear. B. Fish began living in freshwater habitats only after originating elsewhere. C. Lobe-finned fish radiated into almost all available aquatic habitats...
Amphibians and reptiles retain the ___ of their fish ancestry lateral undulations Amphibians axial muscles remain segmented Segmented muscles reduces in birds and mammals which dont undulate as much Epaxial Muscles in amphibians -Major one: dorsalis trunki-small interspinalis joins vertebrae Epaxial...
-Result in speciation or the emergence of new species. -Example: the emergence of tetrapods. Tetrapods are four-limbed organisms (even if they don't move about on all four limbs) that evolved from a lobe-finned or fleshy-finned fish about 400 million years ago....