How do scientists measure time? (3 complete sentences please)

It may seem like a strange way to measure time, but the duration of a specific number of oscillations, or “ticks,” in a wave of electromagnetic radiation is the official method by which scientists define the second.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be