代写论文：鱼类的生存方式
水在边缘处移动较小，并且在中心快速移动。因此鱼类必须适应快速移动的中心。他们会游到水面下或海底地区。有些鱼必须经受当前的游泳，因此它们通常是横截面的。三文鱼和鳟鱼通常是圆形的。身体形状帮助他们支持他们的速度，并且使他们更容易以更好的方式进行机动（NH环境服务部，2017）。一些位于中间的表面饲养鱼类会产生背眼和翘嘴，以帮助它们寻找昆虫，鱼类等鱼类能够承受潮流。像吸盘和鲶鱼这样的底栖生物将作为底部碎片中的清除剂存在。他们有适应，帮助减少漂浮，如减少的swim。在某些情况下，swim可能位于其后端，这将有助于将它们指向下方。嘴是圆形的，指向下方。
代写论文：鱼类的生存方式
The water is low moving at the edges and is fast moving at the center. Fishes hence have to adapt to the fast-moving center. They will swim just below the surface or at the benthic region. Some fishes have to swim withstanding the current and hence they are usually round in cross section. Salmon and trout are usually round. The body shape helps them support their speed and it makes it easy for them to maneuver in a better manner (NH Department of Environmental Services, 2017). Some fish that are surface feeders which are in the middle would have developed dorsal eyes and an upturned mouth in order to help them seek insects, and fishes like killifish are able to withstand the current. Benthic organisms like suckers and catfish would be present as scavengers in the bottom debris. They have adaptations that help lessen floatation, such as a reduced swim bladder. In some, the swim bladder could be at their rear end and this will help point them in a downward fashion. Mouths are circular and are pointed downward.