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Many celled organisms are referred to as multicellular organisms. In order for single cells to form into multicellualr organisms, they must identify and attach themselves to other cells.
Nonvascular plants, for instance, the mosses, have root-like structures called rhizoids used to attach themselves to soil, trees, rocks and other structures.
Porifera is the phylum that includes all sessile organisms, such as sponges. These organisms are simple, filter-feeding animals that attach themselves to substrates and do not move from place to place.
Chordae tendinae are the string-like structures that attach to the AV valves of the heart.
Tendons.
tendons
It's a special paint applied to the hull of a boat, that surpresses the growth of organisms that would otherwise attach themselves to the hull surface.
Astronauts have to attach themselves to something because they will float around in the spacecraft if they do not.
yazi
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.
actin
Attach muscle to bone.