Topic content:
Use the following concepts to draw a concept map: primitive life, primitive unicellular organisms, protozoa, flatworms, coelenterates, linear animals, echinoderms, fish, amphibians, reptiles, birds, algae, angiosperms, gymnosperms, ferns
Best answer:
(1) There was no life on the earth at first, and life experienced a process of development from scratch. The original primitive life came into being. After the formation of primitive life, due to different nutritional methods, some of them evolved into primitive single celled animals that did not contain chloroplasts and could not support themselves, and the other part evolved into primitive single celled animals that contained chloroplasts Autotrophic primitive unicellular algae. It can be seen from the biological evolution tree, Primitive unicellular animals → primitive coelenterates → primitive flatworms → primitive linear animals → primitive annelids → primitive molluscs → primitive arthropods → primitive echinoderms. Invertebrates evolved into vertebrates. The evolution process of vertebrates: primitive fish animals → primitive amphibians → primitive reptiles → (birds and mammals) The evolutionary process of plants: primitive algae → primitive bryophytes and primitive ferns → primitive seed plants (including primitive gymnosperms and primitive angiosperms)
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Test core:
Biological classification units: the main biological classification units are kingdom, phylum, class, order, family, genus and species. There are also subspecies (abbreviated as subsp.), plants and varieties (abbreviated as var.). Sometimes there are some auxiliary grades. In fact, the main classification grade terms are prefixed with super - and sub -. Sometimes, infraclass and infraorder are set respectively under subclass and suborder. Example: Taking the well-known name Felisdomesticus (domestic cat) as an example, its classification system and name are as follows: Animalia, Chordata, Vertebrata, Vertebrata, Mammalia, Mammalia, Carnivora, Felidae, Felis