Maybe if you show the question people could answer
Answer:
Ostia are tiny pores present all over the body of sponges. its function is to let the water, along with desire nutrient flows interior of the sponges.
Answer:
Explanation:
It depends on the geography of your environment. I'd recommend using Solar Panels in a hot area, or Windmills/Wind energy in an area with lots of wind. There are other options too, like water/tidal energy for a place in the Caribbean or surrounded by lots of water. Pick one of those.
