Misc: What is a "ruderal"?

Questions

certain ---------- emit a light so penetrating that it can pass through flesh and wood?

certain fireflies emit a light so penetrating that it can pass through ---------- and wood?

certain fireflies emit a light so penetrating that it can pass through flesh and----------?

certain ---------- can be frozen solid then thawed, and continue living?

certain species of male butterflies produce scents that serve in attracting females during----------?