A crystals shape is determined by the arrangement of the atoms or molecules inside the crystal.
Light is a form of EM radiation.
EM radiation has no mass (it's just energy packets called photons).
EM radiation can travel through a vacuum. (The speed of light in a vacuum is called c and is around 300,000 m/s).
Hope this helps!
ANSWER:
1. Cellular level aka cells
2. Organelle
3. Organs an example could be the heart
4. Organism
5. Population
6. Abiotic factors? I’m not sure on this one
7. Biosphere
