How amoeba catches its prey?
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The amoeba heads toward the unsuspecting paramecium It begins to spread out it's body to catch its prey Too late for the paramecium,it's been caught The amoeba spreads out even more to surround its lunch This microbe starts to look like a big mitten! The amoeba keeps changing its shape \nuntil it can enclose its prey The paramecium will soon be \ncompletely inside the amoeba The amoeba will absorb its lunch directly inside its cell walls
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These are single-celled (unicellular) organisms, and\nhave a well-defined membrane-bound nucleus.\nTheir modes of nutrition may be quite varied.\n• Active feeders: Some protists like Amoeba and\nParamecium (Fig. 23.5) ingest food like most\nanimals. Very often these are also referred to as\nProtozoa (protos: primitive, zoon: animal).\n• Photosynthesizers: Some protists like Euglena\n(Fig. 23.3) have chlorophyll and manufacture\ntheir own food like the plants.\n• Reproduction: Mostly asexual reproduction by\nfission and some reproduce sexually.\n• Occurrence: Many protists live freely in water\nor in soil and many are harmful parasites which\ncause diseases. Some of the protists are\npathogenic, such as Entamoeba histolytica that\ncauses dysentery and Plasmodium vivax that\ncauses malaria.
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Almost all cells reproduce like amoeba. There are very, very few that do not.\n\nSo take your pick. Turkey stomach cells reproduce like amoeba, pine needle cells reproduce like amoeba, human lung cells reproduce like amoeba.
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Yes, because a freshwater amoeba will have to expel water in order to osmoregulate.  A marine amoeba will expel salt ions in order to osmoregulate.
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First we have to understand why leeches need blood to survive.  Blood is made up of rich proteins and lipids that allow a leech to live quite well.  Second, we need to understand the mechanism by which leeches are attracted to their "prey" Basically, all mammals (both warm and cold blooded) are privy to leech attachment.  It has been widely discussed that the exact attraction of leeches to a mammal involves secretion of pheromones and other biological chemicals that a leech's detectors will recognize.  Since other leeches don't secrete these biological chemicals, they are safe from "attack".
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lampreys are parasitic using their circular mouth they attach themselves onto fishes and suck their body fluids for nutrition
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Diatoms. A benefit is that in criminal investigations it can link someone to a crime scene. Also, for example, if you drown someone in a bathtubs and then throw them in a lake forensic scientists can examine the lungs full of water, observe there are no diatoms in her lungs, and conclude she did not drown in the lake but was murdered and place there. Drawbacks of diatoms is most people would prefer they are removed from the water they drink, and this is why there's a water purification process, expensive, but it works.\n\nAlso amoebas can be in water and produce amoebic dysentery, a drawback. The only benefits to an amoeba are keeping the ecosystem of the pond or lake healthy, perhaps consuming harmful bacteria or what not.\n\nAlgae are an organism that lives in the water to provide food for fish. drawbacks are when nitrogen farm run off hits the water it accelerates its growth causing oxygen depleted water and deaths of many fish.\n\nLastly, fish live in the water to provide us food, but some fish eat us as food too!
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some dig holes, have a trap door, waith until prey comes along, and the grabs them...\n\nothers hunt by going out..
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EARTHWORMS.  THEY FEED ON DECAYING PLANTS, DIGEST IT AND FERTILIZE THE SOIL WITH THEIR EXCREMENT.  ALSO, THE ":SLIME" THEY SECRETE ALSO KEEPS THE SOIL MOIST.
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I don't know what you're protisting, but a frozen amoeba will retain a constant shape.
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Protozoa are microscopic organisms, bigger than Bacteria, they have evolved and they get food from eating Bacteria.\nWhen they get big enough they split into two exact copies and thereby reproduce and grow.
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That question would require an essay to answer fully.\n\nSome protists, such as kelp, are get energy by photosynthesis.\n\nSome protists, such as Amoeba, get energy by endocytosis.\n\nSome protists, such as Entomoeba, gete energy by direst absorption.\n\nAnd so on and so forth. There are hundreds of thousands of species of protists and they use every conceivable method of obtaining energy.
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Amoeba are a highly evolved immortal life form. The have about 40,000 active genes, because as single-celled organisms they have to be able to do everything chemically.
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The mouth, located at the center of one end of the body, opens into a gastrovascular cavity, which is used for digestion and distribution of food; an anus is lacking.\nAn evolutionary advance the Cnidarians have over sponges is extracellular \ndigestion of food. What this means is Cnidarians actually have a special \ngut cavity for digestion of captured food, rather than allowing each cell \nto do it, like a sponge does. All animals from Cnidarians up have kept \nthis feature! It's very important and allows the animal to be much more \nefficient.\n\nCnidarians (and Hydra) have a gut cavity with only a single opening. \nDigestive enzymes are released from the gut wall and help in the break-\ndown of the food. Once the food has been broken up into smaller particles, \ncells from the gut wall start engulfing the bits using the \nprocess "phagocytosis" (the same way an amoeba feeds).\n\nThe incredible thing about Cnidarian digestion is that when they arose, \nthey were the first animal ever to be able to eat and successfully digest \na piece of food LARGER that itself (although only small pieces by small \npieces).
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Fish eat other fish. Bigger ones eat smaller ones. In the case of a whale, notice its strainer type mouth? They take in large quantities of Crill which are very small shrimp. Others feed by sucking plankton or moss off rocks (thus cleaning). Others by snatching flying or swimming bugs off the surface.
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Amoeba are single celled organisms.  They are found in a variety of places and serve a variety of purposes.
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Usually they are scavenging feeders but to be specific they eat certain types of fish, crusteans and mollusks such as octopuses, squids and crabs\n\nhttp://www.sea-ex.com/fishphotos/flathead.htm