The inner protoplasmic content or inner mass of a sarcode organism, particularly in protozoans.
From 'endo-' (within) + 'sarc' (from Greek 'sarx,' meaning flesh or protoplasm). This term emerged in 19th-century protozoology to describe the internal structure of single-celled organisms.
The endosarc is basically the gooey inside of a microscopic organism—it's where all the action happens, from digesting food to reproducing, which is why scientists studying tiny creatures care about this inner structure.
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