The answer isn't going to be a very specific one as it's more of an abstract idea. See most sponges are made of protein fiber strands kind of like threads. Many of the surfaces in the ocean are porous so sea sponges dont have a foot or anything like that, their bottom is made out of the same stuff that the rest of their body is made of because the fibers/threads can just web themselves onto the surface and attach by going into the pores for anchor.
Some sponges are able to attach to sediment surfaces like sand by actually growing a type of root for anchor.
Most corals have attach themselves to underwater objects and remain there for life. Some corals possess toxins that make them unappetizing to underwater creatures.
Sponges are bottom-dwelling creatures that attach themselves to something solid, such as a rock. They rely on the system of the water canal to deliver food and oxygen to them. Sponges consume plankton.
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Sponges use currents or contract their bodies to provide movement. Most will attach themselves to the bottom and stay there for the rest of their lives.
The smallest group of invertebrates are sponges. They live in the ocean, fresh water ,lakes. and streams. Some things attach themselves to other things so they can get food.
Astronauts have to attach themselves to something because they will float around in the spacecraft if they do not.
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Baby sponges are simply referred to as larva. At the larva stage, they swim around in the water, but full grown sponges attach themselves to reefs and don't swim or move around.
Probes attach themselves to nothing.Probes are attached by technicians to various points in a circuit that need to be examined to test a circuit.
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Modern sponges are predominantly marine, with some 150 species adapted to freshwater environments. Their habitats range from the inter-tidal zone to depths of 6,000 metres (19,680 feet). Certain types of sponges are limited in the range of depths at which they are found. Sponges are worldwide in their distribution, and range from waters of the polar regions to the tropical regions. Sponges are most abundant in both numbers of individuals and species in warmer waters.For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below.
Some parasites have oral suckers, ringed with hooks, which is used to attach themselves to the host.