The answer is filaments.
In biology. Myofilament, filaments of myofibrils constructed from proteins. Protein filament, a long chain of protein subunits, such as those found in hair, muscle, or in flagella. Part of a stamen, the male part of a flower. A chain of cells connected end-to-end. Hypha, a thread-like cell in fungi and Actinobacteria.
The correct answer is D. Starting at the root, prostate, moving to the vas deferens, leading to the testes through the urethra.
Microscopes allowed scientists to observe Prokaryotic cells which make up Bacteria and Archaea. These cells are small and contain no membrane- bound organelles. It allowed them to observe Eukaryotic cells with a nucleus and membrane-bound organelles that perform different life functions.
