a group of lobe-finned fish started a transition from water to land that ultimately led to the evolution of tetrapods-four-limbed animals including amphibians, reptiles, birds, and mammals (some tetrapods, like snakes, have later evolved
From Water to Land One important idea in evolution is that creatures from the oceans slowly evolved to live and walk on land. Fish have different muscles and bone structure than land animals, so the evolution of fish would have required the change of many different kinds of body parts. One...
TF阅读真题答案:https://shimo.im/docs/473QM7NPLmUK7b3w TF 阅读真题支付宝付款入口 https://shimo.im/docs/25q5XaQbGEcMm3Dg TF最新套题 https://shimo.im/docs/e1AzdGa2r7toZ0qW TF听力真题合集https://shimo.im/docs/25q5XBeNVdhDvM3D TF真题(四科目)答案: https://docs.qq.com/doc/DSVFTU...
Water enters a lake from inflowing rivers, from underwater seeps and springs, from overland flow off the surrounding land, and from rain falling directly on the lake surface. Water leaves a lake via outflowing rivers, by soaking into the bed of the lake, and by evaporation. So much is ...
如果对题目有疑问，欢迎来提出你的问题，热心的小伙伴会帮你解答。
auxiliary breathing device for gulping air when the water became oxygen depleted, such as during extended periods of drought.So, these fish had already evolved one of the prime requisites for living on land: the ability to use air as a source of oxygen....
求,关于托福TPO1阅读句法分析Much of the water in a sample of water-saturated sediment or rock will drain from it if the sample is put in a suitable dry place.But some will remain,clinging to all solid surfaces.It is held there by the force of surface tens
Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions. In particularly wet years, short stretches of an otherwise dry stream-bed may have flowing water because the water table rises to intersect the land surface....
these systems emit no heat-trapping carbon dioxide or other air pollutants and need no water for cooling; manufacturing them produces little water pollution. The land under wind turbines can be used for grazing cattle and other purposes, and leasing land for wind turbines can provide extra income...
these systemsemitno heat-trapping carbon dioxide or other air pollutants and need no water for cooling; manufacturing them produces little water pollution. The land under wind turbines can be used for grazing cattle and other purposes, and leasing land for wind turbines can provide extra income fo...