Which of the following is not a nanoscale object? an enzyme a xenon atom a muscle cell a water molecule

The correct answer will be option-A muscle cell.

Explanation:

Nanoscales are the structures less than 100 nm in length which is considered a billionth of a meter scale.  The nanoscales lead to the formation of a new field of study called nanotechnology which finds its use in all perspectives of science.

In the given question, the nanoscale objects are enzymes (3-7) nm) length, the water molecule (0.275 nm), and xenon atom. Since the muscle cell length is usually measured in mm(1-40 mm)

Thus, option-A is the correct answer.

there is none because earth is stationary and flat.