Biology, Life in the deep sea . The report of the Speech of the World ocean is the habitat of a huge number of plants . fish . marine animals . including mammals.
During the day fish the Viper inhabits at great depths of 1000 – 2800 m, and at night rises to the surface to a depth of only 50 m. the Greatest depth . on.
The distribution of animals on Earth
Biology, Distribution of animals on Earth. Work Exam. c. ) 7.the ratio of active and passive Rosselini. (c. ) 8.Migration of animals . (c. ) 9.Periodic migration. (c. ) 10.Non-recurrent migration. (c.
The genera Neopilina and Vema discovered in the Pacific ocean at a depth of several thousand meters .
Biology, Dinosaurs. Facts and theories. The report, the Speech Name always consists of two parts: family names (with capital letters) and name of the species (not capitalized). Continue reading
The sea always attracted people to him, maybe even more than the sky. The world ocean is the habitat of a huge number of plants, fishes, sea animals, including mammals. There are several zones of ocean life. Most inhabited the upper water column, down to 300 meters, as this is the most illuminated part.Area at a depth of from 300 to 1000 metres is the name of the region of penumbra. At a depth of over 1000 meters there is an absolute darkness and intense cold, there are no plants.
The pressure at great depths is very high, at a depth of 3800 m, the pressure is 400 kg cm3 and at a depth of 10900 m – already 7250 kg cm3. The denizens of the deep in different ways have adapted to these difficult conditions. The only food source of deep-sea animals – the corpses of the inhabitants of the upper part of the ocean and bacteria.Their eyes are either absent or reach a high degree of development they are sometimes of enormous size, are often placed on the lateral appendages of the stems or telescoping, is provided with a lens system. So, the eyes of the coelacanth fish have a cylindrical shape, this allows it to see distant objects. Continue reading
Do fish sleep in an aquarium?
What do fish in our aquarium in the afternoon — we can check at any time. And that’s what they do at night when we sleep? You probably haven’t even thought about it, but they also sleep.
Actually, the biological functions of the body fish are very different from mammals. Because of this, owners of aquarium fish is often not familiar with how it works internal organs their underwater Pets.
So, do fish sleep? Yes and no. They are “asleep” in his own way, not the usual way for us. That is, at the time of “rest” they produce a certain type of activity that we call sleep.
People spend in sleep on average eight hours a day. This is equal to approximately one-third of all human life. For humans sleep is a period of time in which our heart rate and breathing decreases, relaxes muscles and a period of inactivity. “Sleep” in animals is defined in the General Veterinary Dictionary as “…a period of rest, during which suspended physical function and reduced sensitivity to external factors”. Continue reading