how does a hydrilla breathe?
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Hydrilla is an aquatic plant,it respires using dissolved oxygen of water.
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Frogs have a THREE chambered heart, not two. Oxygen poor blood flows from right atrium to the ventricle where it is pumped to the lungs and skin to pick up oxygen. Next the blood flows back to the heart, collecting in the left atrium. It them flows to the ventricle and is pumped to the body, dropping off the oxygen. This oxugen poor blood flows back onto the right atrium and it begins again.\n\nThis process is simular in humans except we have two ventricles, and do not breath through or skin as much so the right ventricle pumps to lungs only.
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(if you need this for homework, please rewrite it in a coherent way!)\nThe plants that live in xeric (=dry) environments are called xerophytes and have many adaptations that help reduce water loss. Basically these include mechanisms for 1) reducing body surface (because evaporation/transpiration is directly proportional to body surface) and 2) reinforcing their "skin" to make it less permeable.\n\nAdaptations tending to 1) include:\n- Small and thick or absent leaves, may be transformed into spines; they photosinthesize with their stems (such as cacti)\n- Short, stumpy shape; rounded stems.\n\nAdaptations tending to 2) include:\n- Leaves with multilayered epidermis and a thick waxy cover (waterproof)\n- Leaves may be covered with hairs.\n- Small stomata, situated in recessed crypts\n- Some have the stomata open only during the nighttime (CAM metabolism)
1155102
As we come to the vertebrates, we begin to find real efficiencies with the closed system. Fish possess one of the simplest types of true heart. A fish's heart is a two-chambered organ composed of one atrium and one ventricle. The heart has muscular walls and a valve between its chambers. Blood is pumped from the heart to the gills, where it receives oxygen and gets rid of carbon dioxide. Blood then moves on to the organs of the body, where nutrients, gases, and wastes are exchanged. However, there is no division of the circulation between the respiratory organs and the rest of the body. That is, the blood travels in a circuit which takes blood from heart to gills to organs and back to the heart to start its circuitous journey again.\n\nFrogs have a three-chambered heart, consisting of two atria and a single ventricle. Blood leaving the ventricle passes into a forked aorta, where the blood has an equal opportunity to travel through a circuit of vessels leading to the lungs or a circuit leading to the other organs. Blood returning to the heart from the lungs passes into one atrium, while blood returning from the rest of the body passes into the other. Both atria empty into the single ventricle. While this makes sure that some blood always passes to the lungs and then back to the heart, the mixing of oxygenated and deoxygenated blood in the single ventricle means the organs are not getting blood saturated with oxygen. Still, for a cold-blooded creature like the frog, the system works well. Humans and all other mammals, as well as birds, have a four-chambered heart with two atria and two ventricles. Deoxygenated and oxygenated blood are not mixed. The four chambers ensure efficient and rapid movement of highly oxygenated blood to the organs of the body. This has helped in thermal regulation and in rapid, sustained muscle movements.
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Depends on the plant.  Some plants, like kelp or Utricularia thrive when totally immersed.  Others cannot transpire properly unless their leaves are exposed to air, and will 'drown' in water.
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They don't swallow the water, per se - they simply swim and let the water flow past their gills.  As the water flows throughout the network in their gills, the oxygen that's dispersed throughout the water enters their bloodstream, thus enabling the fish to breathe underwater!\n\nThis is why when one purchases a fish tank, one has to get an oxygen supplier as well - no fish can survive in just standing water for long!
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aside from gills, they also have lungs.
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Harp seals breathe through their mouth and nose.  I have seen them go under for 30 minutes, but usually when they "play" next to your kayak they are under for 10 minutes and then pop up just off your bow.  With their head out of the water, they then rotate 360 degrees looking for dangers.\n\nThey protect themselves by being fast underwater swimmers.\n\nWe call the babies pups.\n\nTravel is a swim, waddle or hitchhiking on an ice flow.
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Mudskipper is not an amphibian because it does not have lungs.It breathes by gills and hence it is a fish.\n\nWhen other fishes are taken out of water their gill filaments stick and are unable to absorb gaseous oxygen and hence they die.But the mudskipper uses a technique in which it can retain water in enlarged gill chambers. They rotate their eyes to swill the water in the gill chambers around and keep the gills fluffed up and oxygenated. \nMudskippers also have to regularly replenish the water in their gill chambers so they cannot stay far from water. \nPlz check the site it might be of help to you.
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Insects do not have lungs.  The larger ones breathe through tubes into their body called spiracles and/or smaller tubes called tracheae.  Very small insects breathe through their skin using the process known as diffusion.
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One of the difficulties that water plants have that land plants do not is gas exchange.  Plants need to be able to get air to their roots and aquatic plants usually do this through special tissues that lead to the air.
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Reptiles breath through thier skin.
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Well plants are organisms that don't breathe in oxygen. They breathe in carbon dioxide.
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Plants.\n\nThey breathe in CO2 and breathe out Oxygen
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They live beneath the sea, so they definitely don't breathe.  I think that each individual cell in the Sea Cucumber absorbs oxygen directly from the seawater.
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Very wet!\n\nTry it yourself.  Take a sprinker head and put in on a hose up as high as you can support it.  Place a bucket below.  Turn on the water and adjust it until you get your 1.5 inches per minute in the bucket.  \n\nGo stand in the flow.\n\nVery wet!
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They have breathing holes on their heads.When they need oxygen,they will swim onto the surface of the water and take in the oxygen.