Cells are the most simple level of organization, as tissues contain cells, organs contain tissues and systems contain organs, so R would be your answer.
C.) Scanning electron microscope. You would not be able to see a whole insect with one of these.
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The correct answer is actin. Microfilaments are made form a ball-shaped protein called actin. These actins are globular proteins who are the ones responsible for the formation of microfilaments. It is mostly found in the eukaryotic cells.
Herbaceous stem grow thicker as a result of cell division in the vascular cambium of the stem.
The two lower leg bones are called the tibia and the fibula
