Why do Fish have Scales? Learn why fish have scales, and how they are beneficial with the help of this sea biology for kids animated educational module.
Catfish are different from most other fish. Catfish do not have scales(鱼鳞). Instead, they have a smooth body. These spines(脊柱)on their side and back can wound a person or animal that tries to get this fish the wrong way. There are over 2, 000 different kinds of catfish One of...
选1，意为“你有鱼肉吗？”或“你吃鱼肉吗？”，此时 fish 为不可复名词。选3，意为“你有一条鱼吗？”，此时fish为可数名词。虽说fish不可数，但也能用fishes 这么说吧，一群（相同种类的）鱼，a mass of fish，many fish暗指鱼同一种类 而当指不同种类时，即许多鱼（暗指种类繁多时)常用...
aGWS are fish, but unlike most fish do not have bones but rather a "cartilaginous". Two other differences are their scales which are not smooth and their gills which are not covered like most fish but are open. GWS是鱼,但不同于多数鱼不要有骨头,而是宁可一“软骨”。 其他二个区别是不是...
Anderson, RC (1996) Why do fish have so few roundworm (nematode) parasites?. Environ Biol Fish 6: pp. 1-5Anderson, R.C. (1996) Why do fish have so few roundworm (nematode) parasites? Environmental Biology of Fishes 46, 1 - 5....
Buoyancy is the ability to float in water or other fluids. Sharks need to put effort into remaining buoyant. In fact, if they stop swimming they will sink. Most bony fish have a swim bladder. A swim bladder is an internal organ filled with gas that helps the fish float without having ...
What can little fish do?What can little dog do?Free talkWhat can you do?I can ...English PartyPresentationWe’ll have an English party next Tuesday!We’ll have an English party next Tuesday!We’ll=We will (将要)English party(派对)next(下一个的) Tuesday禁止倒卖课件,禁止拿课件参赛,违者...
Source: http://www.bycaitlin.com/Koi Fish-and-koi.html How Fast Do Baby Koi Fish Grow? The size and colors of each baby Koi will depend on the kind of Koi you have. Like the previous chart, this is an average idea of what you can expect from your Koi as it matures, but the ...
astomach. 正在翻译,请等待...[translate] aa day out 天[translate] amost of fish do not have eyelids and they keep their eyes open because fish do not need to sleep 大多数鱼没有眼皮,并且他们保持他们的眼睛开放,因为鱼不需要睡觉[translate]...
sharks. Cristina still remembers clearly the first time she managed to take out a huge hook(钓钩) from a tiger shark’s mouth. Up to now, she has taken out hundreds of hooks and fishing lines from shark mouths and skin without hurting them. Her work has saved many sharks from possible ...