The tiny holes in a sponges outer layer that take in water are called ostia, I believe. Hope it helps
Answer:
Most common insulation materials work by slowing conductive heat flow and--to a lesser extent--convective heat flow. Radiant barriers and reflective insulation systems work by reducing radiant heat gain. To be effective, the reflective surface must face an air space.
Explanation:
To be effective, the reflective surface must face an air space.
4, 2, 1, and 3 is the answer
Their should be two molecules of hydrogen (h2) to produce 2 moles of h2O2
